Insufficient Roof Panel Joint Strength – 2011-2023 Thomas Built EFX & HDX School Buses

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Defect / Noncompliance Information Report (Section 573.6) FL957 Date of Submission: 10/12/2022 Manufacturer: Daimler Truck North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: ⃝ Safety Defect x Non-Compliance Vehicle Information Model Yr. Start: 2011 Model Yr. End: 2023 Make: Thomas Built Buses Model: Thomas Saf-T-Liner HDX and Thomas Saf-T-Liner EFX Production Dates: Begin: 03/01/2010 End: 08/01/2022 Descriptive Information: On certain Thomas Built Buses Saf-T-Liner HDX and Saf-T-Liner EFX school buses the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. If the adhesive is improperly applied, the joint may not meet the joint strength requirement of FMVSS 221 S5.1. Basis for Determination of the Recall Population: Thomas Built Buses Saf-T-Liner HDX and EFX school buses built with certain roof lap joint configurations and manufactured in the production range listed above. Number potentially involved: 17613 Estimated percentage of involved with defect: 80% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain Thomas Built Buses Saf-T-Liner HDX and EFX school buses, the roof exterior joint with improperly applied adhesive was found to not meet the joint strength requirement of FMVSS 221 S5.1. Describe the safety risk: A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 S5.1 may increase the risk of injury in the event of a crash. Identify any warning which can precede or occur: NA If applicable, identify the manufacture of the defective or noncompliant component.: There are no defective or noncompliant components on the affected school buses. This issue is related only to assembly of the joint components on the affected school buses. Involved Components Component Name: Roof Sheet panel Component Description: Roof Sheet panel Component Part Number: 140599, 56000857, 56000896, and 56001211 Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In 2010, Thomas Built Buses (TBB) established a new procedure for the exterior roof sheet lap joint adhesion validated to FMVSS 221 requirements through good engineering judgment and analysis. In 2011, TBB validated the roof sheet joint, performing physical testing against FMVSS requirements, and found that the joints passed with considerable margin. From that time until recently, TBB continued to produce the same design, with the same manufacturing process, and therefore had no reason to believe the joint did not comply with the standards. On September 1, 2022 NHTSA Office of Vehicle Safety Compliance notified TBB that a sample, taken from a Saf-T-Liner HDX school bus that the agency had purchased, failed the FMVSS 221 joint strength test for the exterior roof lap joint. Immediately, on September 2, 2022, based on the testing information provided by NHTSA, TBB began an investigation to evaluate the potential noncompliance, determine the scope, and establish the potentially affected population. September 9, 2022 TBB requested a visit to NHTSA’s test facility to review findings and the test equipment and procedures. On September 22, 2022, TBB visited Applus IDIADA Karco Engineering. In late September, 2022 TBB reviewed data from that visit and conducted additional engineering verification testing that suggested previously-unexpected manufacturing variability in joint strength. On October 6, 2022, TBB promptly decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses HDX and EFX school buses that may be built with roof exterior roof sheet lap joints with improperly applied adhesive, which subsequently may not meet the joint strength requirement of FMVSS 221 S5.1. TBB has received no warranty claims, no field reports, no customer complaints, no information of injury nor fatality, nor any other indication of a noncompliance until NHTSA’s September 2022 notification. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. The repair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Identify the Recall Schedule Describe the recall schedule for notifications.: Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Begin Date: 12/10/2022 Planned Dealer Notification End Date: 12/10/2022 Planned Owner Notification Begin Date: 12/10/2022 Planned Owner Notification End Date: 12/10/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes X No Manufacturer’s identification code for this recall (if applicable): FL957 DTNA Representative; Sam Geser Manager, Compliance and Regulatory Affairs

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Daimler Truck North America LLC IMPORTANT SAFETY RECALL This notice applies to your vehicle(s), See enclosed VIN list December 2022 FL957 Interim Recall Notice NHTSA #22V762 (School Bus) REVISED NOTICE Subject: Thomas Built Bus Roof Sheet Joint This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that certain 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022 fail to conform to Federal Motor Vehicle Safety Standard No. 221, School Bus Body Joint Strength. The roof exterior joint was manufactured with insufficient strength may separate during a crash and could increase the risk of injury in the event of a crash. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. Daimler Truck is currently securing replacement parts. There is no action for you to take at this time. The second notice will inform you when the final, free remedy is available. When you receive the second notice, please contact your authorized Daimler Truck North America dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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Daimler Truck North America LLC IMPORTANT SAFETY RECALL This notice applies to your vehicle(s), See enclosed VIN list December 2022 FL957 Interim Recall Notice NHTSA #22V762 (School Bus) Subject: Thomas Built Bus Roof Sheet Joint This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that certain 2021-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022 fail to conform to Federal Motor Vehicle Safety Standard No. 221, School Bus Body Joint Strength. The roof exterior joint was manufactured with insufficient strength may separate during a crash and could increase the risk of injury in the event of a crash. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. Daimler Truck is currently securing replacement parts. There is no action for you to take at this time. The second notice will inform you when the final, free remedy is available. When you receive the second notice, please contact your authorized Daimler Truck North America dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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Daimler Truck North America LLC IMPORTANT SAFETY RECALL This notice applies to your vehicle(s), see enclosed VIN list. May 2023 FL957 NHTSA #22V762 (School Bus) Subject: Thomas Built Bus Roof Sheet Joint This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that certain model year 2011-2023 Thomas Built EFX and HDX vehicles manufactured March 1, 2010, through August 1, 2022 fail to conform to the Federal Motor Vehicle Safety Standard No. 221 “School bus body joint strength.” On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, search online at https://northamerica.daimlertruck.com/contact-us. Scroll down to “Locate a Dealer” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall at the following URL: https://dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If your dealer fails to remedy the defect without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Truck North America LLC Reimbursement to Customers for Repairs Performed Prior to Recall If you have already paid to have this recall condition corrected you may be eligible to receive reimbursement. Requests for reimbursement may include parts and labor. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized Daimler Truck North America LLC dealer. The following documentation must be presented to your dealer for consideration for reimbursement. Please provide original or clear copies of all receipts, invoices, and repair orders that show • The name and address of the person who paid for the repair • The Vehicle Identification Number (VIN) of the vehicle that was repaired • What problem occurred, what repair was done, when the repair was done • Who repaired the vehicle • The total cost of the repair expense that is being claimed • Proof of payment for the repair (such as the front and back of a cancelled check or a credit card receipt) Reimbursement will be made by check from your Daimler Truck North America LLC dealer. Please speak with your Daimler Truck North America LLC authorized dealer concerning this matter. Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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Subject: Thomas Built Bus Roof Sheet Joint Models Affected: Specific model years 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022. General Information Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that a defect that relates to motor vehicle safety exists on the vehicles mentioned above. On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that form the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. There are approximately 17,916 vehicles involved in this campaign. Additional Repairs Dealers must complete all outstanding Recall and Field Service campaigns prior to the sale or delivery of a vehicle. A Dealer will be liable for any progressive damage that results from its failure to complete campaigns before sale or delivery of a vehicle. Owners may be liable for any progressive damage that results from failure to complete campaigns within a reasonable time after receiving notification. Work Instructions Please refer to the attached work instructions. Replacement Parts Replacement parts are now available and can be obtained by ordering the kit and/or part number(s) listed below from your facing Parts Distribution Center. NOTE: One reusable fixture kit TBB 240564 is required for campaign completion. Order allocation of Qty = 1 per dealer. If additional kit is needed, contact the Customer Assistance Center at 1-855-639-8686, from 8 a.m. to 5 p.m. Eastern time, Monday through Friday. If our records show your dealership has ordered any vehicle(s) involved in campaign number FL957, a list of the customers and vehicle identification numbers will be available on DTNA Portal. Please refer to this list when ordering parts for this recall. Table 1 – Replacement Parts for FL957 Campaign Number Part Description Part Number Qty. FL957A-D SCREW TAPPING NO.12 TBB 69003250 1 pack (400pcs) Table 1 Removed Parts U.S. and Canadian Dealers, please follow Warranty Failed Parts Tracking shipping instructions for the disposition of all removed parts. Export distributors, please destroy removed parts unless otherwise advised. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 1 Labor Allowance Table 2 – Labor Allowance Campaign Number Procedure Time Allowed (hours) SRT Code Corrective Action FL957A Repair joints/seams 7, 8, 9 with A/C 4.0 996-R202A 12-Repair Recall/Campaign FL957B Repair joints/seams 7, 8, 9 without A/C 2.5 996-R202B 12-Repair Recall/Campaign FL957C Repair joints/seams 10, 11, 12 with A/C 5.0 996-R202C 12-Repair Recall/Campaign FL957D Repair joints/seams 10, 11, 12 without A/C 3.5 996-R202D 12-Repair Recall/Campaign Table 2 Claims for Credit You will be reimbursed for your parts, labor, and handling (landed cost for Export Distributors) by submitting your claim through the Warranty system within 30 days of completing this campaign. Please reference the following information in OWL: • Claim type is Recall Campaign. • In the Campaign field, enter the campaign number and appropriate condition code (e.g. FL957-A, FL957-B, etc.). • In the Primary Failed Part Number field, enter 25-FL957-000. • In the Parts field, enter the appropriate kit or part number(s) as shown in the Replacement Parts Table. • In the Labor field, enter the appropriate SRT from the Labor Allowance Table. • The VMRS Component Code is F99-999-005 and the Cause Code is A1 – Campaign. • U.S. and Canada — Reimbursement for Prior Repairs. When a customer asks about reimbursement, please do the following: • Accept the documentation of the previous repair. • Make a brief check of the customer’s paperwork to see if the repair may be eligible for reimbursement. (See the “Copy of Owner Letter” section of this bulletin for reimbursement guidelines.) • Submit an OWL Recall Pre-Approval Request for a decision. • Include the approved amount on your claim in the Other Charges section. • Attach the documentation to the pre-approval request. • If approved, submit a based on claim for the pre-approval. • Reimburse the customer the appropriate amount. IMPORTANT: OWL must be viewed prior to performing the recall to ensure the vehicle is involved and the campaign has not been previously completed. Also, check for a completion sticker prior to beginning work. U.S. and Canadian dealers, contact the Warranty Campaigns Department using WSC app located on DTNA Portal, if you have any questions or need additional information. Export distributors, submit a Web inquiry or contact your International Service Manager. U.S. and Canadian Dealers: To return excess kit inventory related to this campaign, U.S. dealers must submit a Parts Authorization Return (PAR) to the Memphis PDC. Canadian dealers must submit a PAR to their facing PDC. All kits must be in resalable condition. PAR requests must include the original purchase invoice number. Export Distributors: Excess inventory is not returnable. The letter notifying U.S. and Canadian vehicle owners is included for your reference. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 2 Please note that the National Traffic and Motor Vehicle Safety Act, as amended (Title 49, United States Code, Chapter 301), requires the owner’s vehicle(s) be corrected within a reasonable time after parts are available to you. The Act states that failure to repair a vehicle within 60 days after tender for repair shall be prima facie evidence of an unreasonable time. However, circumstances of a particular situation may reduce the 60 day period. Failure to repair a vehicle within a reasonable time can result in either the obligation to (a) replace the vehicle with an identical or reasonably equivalent vehicle, without charge, or (b) refund the purchase price in full, less a reasonable allowance for depreciation. The Act further prohibits dealers from selling a vehicle unless all outstanding recalls are performed. Any lessor is required to send a copy of the recall notification to the lessee within 10 days. Any subsequent stage manufacturer is required to forward this notice to its distributors and retail outlets within five working days. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 3 Copy of Notice to Owners Subject: Thomas Built Bus Roof Sheet Joint For the Notice to Canadian Customers: This notice is sent to you in accordance with the requirements of the Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that a defect which relates to motor vehicle safety exists in certain model years 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022. On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, search online at https://northamerica.daimlertruck.com/contact-us. Scroll down to “Locate a Dealer” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall at the following URL: https://dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you have a safety concern relating to this Recall, you may wish to contact Transport Canada – Motor Vehicle Safety at, 80 rue Noel, Gatineau, Quebec J8Z 0A1 or phone (800) 333-0510. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D Transport Canada #2022-577 (School Bus) Page 4 Copy of Notice to Owners Subject: Thomas Built Bus Roof Sheet Joint For the Notice to U.S. Customers: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that that certain model year 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022, fail to conform to the Federal Motor Vehicle Safety Standard No. 221 “School bus body joint strength.” On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, search online at https://northamerica.daimlertruck.com/contact-us. Scroll down to “Locate a Dealer” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall at the following URL: https://dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If your dealer fails to remedy the defect without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Page 5 Reimbursement to Customers for Repairs Performed Prior to Recall If you have already paid to have this recall condition corrected you may be eligible to receive reimbursement. Requests for reimbursement may include parts and labor. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized Daimler Truck North America LLC dealer. The following documentation must be presented to your dealer for consideration for reimbursement. Please provide original or clear copies of all receipts, invoices, and repair orders that show: • The name and address of the person who paid for the repair • The Vehicle Identification Number (VIN) of the vehicle that was repaired • What problem occurred, what repair was done, when the repair was done • Who repaired the vehicle • The total cost of the repair expense that is being claimed • Proof of payment for the repair (such as the front and back of a cancelled check or a credit card receipt) Reimbursement will be made by check from your Daimler Truck North America LLC dealer. Please speak with your Daimler Truck North America LLC authorized dealer concerning this matter. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 6 Work Instructions Subject: Thomas Built Bus Roof Sheet Joint Models Affected: Specific model years 2011-2023 school buses manufactured March 1, 2010, through August 1, 2022. Roof Joint Repair 1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires. NOTE: The main power disconnect switch (MPDS) is located in the battery box compartment. 2. Turn the MPDS to the OFF position. 3. Disconnect the negative battery cables at the batteries. NOTE: One reusable fixture kit TBB 240564 is required for campaign completion. Order allocation of Qty = 1 per dealer. If additional kit is needed, contact the Customer Assistance Center at 1-855-639-8686, from 8 a.m. to 5 p.m. Eastern time, Monday through Friday. 4. A marking fixture (template) is used for each type of roof joint repair to locate the position of the additional screws. The three different fixtures, and their applications are listed in Table 3. Fixture Types and their Applications Fixture # Part Number Application Figure Reference Fixture Kit TBB 240564 Kit Includes: Fixture A, B, and C — Fixture A TBB 240418 Used for Standard/Typical Roof Joint Fig. 1 Fixture B TBB 242524 Used for Roof Hatch Joint with One Hole between the Centerline of Vehicle Fig. 2 Fixture C TBB 242525 Used for Roof Hatch Joint with Two Holes straddling the Centerline of Vehicle Fig. 3 Table 3, Fixture Types and their Applications 05/17/2023 f750109 A A. Medium-sized hole located in the center of the fixture. Fig. 1, Fixture A 05/17/2023 f750110 A A. Medium-sized hole located in the center of the fixture. Fig. 2, Fixture B Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 7 5. If equipped with a roof-top air-conditioning (A/C) system, as shown in Fig. 4, remove the A/C condenser unit to access the roof joint for repair. Is the vehicle equipped with a roof-top A/C system? YES → Follow steps 6 through 10 to remove the roof-top A/C unit. NO → Proceed to step 11. 05/17/2023 f750111 A A. Two medium-sized holes located in the center of the fixture. Fig. 3, Fixture C 05/17/2023 f750106 Fig. 4, Vehicle Equipped with Factory-Installed Roof- Top A/C Unit Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 8 05/25/2023 f750107 1 1. Huck Rivet Fig. 5, Roof-Top A/C Secured with Huck Rivets 05/25/2023 f750128 1 1. Putty Cartridge with Nozzle Fig. 6, Roof-Top A/C Sealed with Putty Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 9 NOTE: The instructions for the roof-top A/C unit disconnection and removal are for a typical unit. Depending on the configuration of the vehicle being repaired, the instructions may slightly vary. 6. Remove the A/C roof-top guard, if so equipped. 7. Remove the six mounting screws that hold the plastic condenser cover in place. Set the cover aside. 8. Remove the ten Huck rivets that secure the condenser to the roof. See Fig. 5. 9. Loosen the putty that seals the unit to the roof. See Fig. 6. 05/17/2023 f750108 Fig. 7, Roof-Top A/C Plumbing Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 10 10. Check if the A/C unit can be lifted and repositioned. Can the A/C unit be lifted and repositioned? YES → Lift and reposition the AC unit to access the roof joint. NO → Evacuate the refrigerant, and disconnect the roof-top A/C plumbing, shown in Fig. 7. Reposition the A/C unit to access the roof joint. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 11 NOTE: Some rivets may not be fitted in the exact center. 13. Adjust the left-hand side and right-hand side ends of the fixture to align with the rivets. 05/17/2023 f750112 1 2 3 5 4 6 1. Vehicle Centerline 2. Standard/Typical Roof Joint 3. Left-Hand Side End of Fixture 4. Right-Hand Side End of Fixture 5. Fixture A 6. Roof Joint with Hatch Fig. 8, Standard Joint Repair 05/17/2023 f750113 1 2 A A. Align the center rivet in the medium-sized hole of the fixture. 1. Vehicle Centerline 2. Fixture A Fig. 9, Aligning the Center Rivet, Fixture A 11. To repair the standard roof joint, place the fixture A over the center rivet of the roof joint on the vehicle, as shown in Fig. 8. 12. The center rivet should fit securely in the medium-sized hole, located near the center of each fixture, as shown in Fig. 9. 14. Secure the fixture to the roof using duct tape to prevent movement of the fixture while marking the new hole locations. Make sure not to cover any holes on the fixture with duct tape. NOTICE Do not mark every hole on the fixture. Mark only the holes identified by yellow circles in Fig. 10 and Fig. 11. IMPORTANT: A standard joint should have 28 pilot hole marks. 15. Once the fixture is secured in place, locate the rivets, and follow the arrows shown in Fig. 10 to identify the marking locations. Use a Sharpie marker to mark the pilot holes for drilling the holes in the roof. 16. The center rivet has two marked locations, connected by lines. See Fig. 12. 05/17/2023 f750114 Fig. 10, Identifying the Marking Locations 05/17/2023 f750115 Fig. 11, Pilot Hole Locations 05/17/2023 f750116 Fig. 12, Two Marked Locations Connected to the Center Rivet Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 12 17. Once all pilot holes are marked, remove the fixture. Make sure the number of markings is equal to 28. 18. Use a 3/16-inch drill bit and a drill stopper along with a corded drill to drill 1/2-inch deep holes in all the marked locations. See Fig. 13. NOTICE Care should be taken while cleaning. Do not damage the paint on the roof. 19. Remove any metal chips, and clean the drilled surface with a brush. 20. Install a screw in each pilot hole. See Fig. 14. Verify that 28 screws are added per joint. 05/17/2023 f750117 Fig. 13, Corded Drill with 3/16-Inch Drill Bit 05/17/2023 f750118 Fig. 14, Installing the Screws along the Joint Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 13 CAUTION Only experienced, qualified persons using proper equipment should attempt repainting or touch-up painting. Incorrect application of chemicals or paint could damage the surface or impair the finish. 22. Re-paint or touch-up wherever required. See Fig. 16. 23. Add caulk on every gap between the roof sheets. 05/17/2023 f750119 Fig. 15, Cleaned Surface 05/17/2023 f750120 Fig. 16, Paint and Brush Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 14 21. Remove any metal chips, and clean the surface with a cloth. See Fig. 15. 25. Fixture B and fixture C are used to repair roof joints that have a roof hatch, as shown in Fig. 18. Depending on the number of rivets at the centerline of the vehicle roof, the appropriate fixture is determined. • If the roof joint has a single rivet at the centerline of the vehicle, use fixture B (TBB 242524). • If the roof joint has two rivets straddling over the centerline of the vehicle, as shown in Fig. 19, use fixture C (TBB 242525). 26. Position the appropriate fixture over the center rivet(s) of the roof joint on the vehicle. See Fig. 18. 05/17/2023 f750121 Fig. 17, Six Fasteners Installed in an Eight-Inch Span 05/17/2023 f750122 1 2 3 1. Vehicle Centerline 2. Fixture B 3. Roof Hatch Fig. 18, Roof Hatch Joint Repair Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 15 IMPORTANT: Any eight-inch span of the seam should have a minimum of six fasteners (including rivets and screws), as shown in Fig. 17. If the number of fasteners is less than six, add additional screws wherever required. 24. Repeat steps 11 through 23 to repair the other standard joints on the vehicle. NOTE: Some rivets may not be fitted in the exact center. 28. Adjust the left-hand side and right-hand side ends of the fixture to align with the rivets. 29. Secure the fixture to the roof using duct tape to prevent movement of the fixture while marking the new hole locations. Make sure not to cover any holes on the fixture with duct tape. NOTICE Do not mark every hole on the fixture. Mark only the holes identified by the arrows and the yellow rectangle in Fig. 20. IMPORTANT: Table 4 shows the number of pilot hole marks to be made for each fixture. 30. Once the fixture is secured in place, locate the rivets, and follow the arrows to identify the marking locations. See Fig. 20. Mark all pilot holes falling in the region identified by the yellow rectangle. Use a Sharpie marker to mark the pilot holes for drilling the holes in the roof. 05/17/2023 f750123 1 3 2 1. Vehicle Centerline 2. Center Rivets Straddling the Centerline 3. Fixture C Fig. 19, Two Rivets Straddling the Centerline 05/17/2023 f750124 Fig. 20, Identifying the Marking Locations Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 16 27. The center rivet(s) should fit securely in the medium-sized hole, located near the center of each fixture, as shown in Fig. 19. 32. Once all pilot holes are marked, remove the fixture. 33. Use a 3/16-inch drill bit and a drill stopper along with a corded drill to drill 1/2-inch deep holes in all the marked locations. See Fig. 13. 05/17/2023 f750125 Fig. 21, Region Showing all Pilot Holes to be Marked, Fixture B 05/17/2023 f750126 Fig. 22, Region Showing all Pilot Holes to be Marked, Fixture C Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 17 31. Mark all pilot holes in the region indicated by ‘MARK EVERY PILOT HOLE WITHIN THIS RANGE.’ See Fig. 21 for fixture B, and Fig. 22 for fixture C. 36. Remove any metal chips, and clean the surface with a cloth. CAUTION Only experienced, qualified persons using proper equipment should attempt repainting or touch-up painting. Incorrect application of chemicals or paint could damage the surface or impair the finish. 37. Re-paint or touch-up wherever required. See Fig. 16. 38. Add caulk on every gap between the roof sheets. IMPORTANT: Any eight-inch span of the seam should have a minimum of six fasteners (including rivets and screws), as shown in Fig. 17. If the number of fasteners is less than six, add additional screws wherever required. 39. After all roof joints are repaired, install the A/C, if so equipped. Evacuate and recharge the refrigerant. 40. Connect the negative battery cables to the battery. 41. Turn the MPDS to the ON position. Repair complete. 05/17/2023 f750127 Fig. 23, Additional Screws Installed Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 18 NOTICE While cleaning, be careful not to damage the paint on the roof. 34. Remove any metal chips, and clean the drilled surface with a brush. 35. Install a screw in each pilot hole, as shown in Fig. 23. See Table 4 for the number of screws to be added per joint. Screw Usage Fixture # Description No. of Screws Fixture B Roof Hatch with One Hole on the Centerline 34 Fixture C Roof Hatch with Two Holes straddling the Centerline 36 Table 4, Screw Usage

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Subject: Thomas Built Bus Roof Sheet Joint Models Affected: Specific model years 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022. General Information Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that a defect that relates to motor vehicle safety exists on the vehicles mentioned above. On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that form the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. There are approximately 17,916 vehicles involved in this campaign. Additional Repairs Dealers must complete all outstanding Recall and Field Service campaigns prior to the sale or delivery of a vehicle. A Dealer will be liable for any progressive damage that results from its failure to complete campaigns before sale or delivery of a vehicle. Owners may be liable for any progressive damage that results from failure to complete campaigns within a reasonable time after receiving notification. Work Instructions Please refer to the attached work instructions. Replacement Parts Replacement parts are now available and can be obtained by ordering the kit and/or part number(s) listed below from your facing Parts Distribution Center. NOTE: One reusable fixture kit TBB 240564 is required for campaign completion. Order allocation of Qty = 1 per dealer. If additional kit is needed, contact the Customer Assistance Center at 1-855-639-8686, from 8 a.m. to 5 p.m. Eastern time, Monday through Friday. If our records show your dealership has ordered any vehicle(s) involved in campaign number FL957, a list of the customers and vehicle identification numbers will be available on DTNA Portal. Please refer to this list when ordering parts for this recall. Table 1 – Replacement Parts for FL957 Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 1 REVISED NOTICE Campaign Number Part Description Part Number Qty. FL957A-D SCREW TAPPING NO.12 TBB 69003250 300 pcs Table 1 NOTE: Please note that changes have been made to parts quantity as well as the SRTs. See Table 1 and Table 2. Labor Allowance Table 2 – Labor Allowance Claims for Credit You will be reimbursed for your parts, labor, and handling (landed cost for Export Distributors) by submitting your claim through the Warranty system within 30 days of completing this campaign. Please reference the following information in OWL: • Claim type is Recall Campaign. • In the Campaign field, enter the campaign number and appropriate condition code (e.g. FL957-A, FL957-B, etc.). • In the Primary Failed Part Number field, enter 25-FL957-000. • In the Parts field, enter the appropriate kit or part number(s) as shown in the Replacement Parts Table. • In the Labor field, enter the appropriate SRT from the Labor Allowance Table. • The VMRS Component Code is F99-999-005 and the Cause Code is A1 – Campaign. • U.S. and Canada — Reimbursement for Prior Repairs. When a customer asks about reimbursement, please do the following: • Accept the documentation of the previous repair. • Make a brief check of the customer’s paperwork to see if the repair may be eligible for reimbursement. (See the “Copy of Owner Letter” section of this bulletin for reimbursement guidelines.) • Submit an OWL Recall Pre-Approval Request for a decision. • Include the approved amount on your claim in the Other Charges section. • Attach the documentation to the pre-approval request. • If approved, submit a based on claim for the pre-approval. • Reimburse the customer the appropriate amount. IMPORTANT: OWL must be viewed prior to performing the recall to ensure the vehicle is involved and the campaign has not been previously completed. Also, check for a completion sticker prior to beginning work. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 2 REVISED NOTICE Campaign Number Procedure Time Allowed (hours) SRT Code Corrective Action FL957A Repair every roof joint where two roof sheets are attached for 7, 8, 9 rafter bus with A/C 4.5 996-R202A 12-Repair Recall/Campaign FL957B Repair every roof joint where two roof sheets are attached for 7, 8, 9 rafter bus without A/C 3.0 996-R202B 12-Repair Recall/Campaign FL957C Repair every roof joint where two roof sheets are attached for 10 to 14 rafter bus with A/C 4.5 996-R202C 12-Repair Recall/Campaign FL957D Repair every roof joint where two roof sheets are attached for 10 to 14 rafter bus without A/C 3.0 996-R202D 12-Repair Recall/Campaign Table 2 Removed Parts U.S. and Canadian Dealers, please follow Warranty Failed Parts Tracking shipping instructions for the disposition of all removed parts. Export distributors, please destroy removed parts unless otherwise advised. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 3 REVISED NOTICE U.S. and Canadian dealers, contact the Warranty Campaigns Department using WSC app located on DTNA Portal, if you have any questions or need additional information. Export distributors, submit a Web inquiry or contact your International Service Manager. U.S. and Canadian Dealers: To return excess kit inventory related to this campaign, U.S. dealers must submit a Parts Authorization Return (PAR) to the Memphis PDC. Canadian dealers must submit a PAR to their facing PDC. All kits must be in resalable condition. PAR requests must include the original purchase invoice number. Export Distributors: Excess inventory is not returnable. The letter notifying U.S. and Canadian vehicle owners is included for your reference. Please note that the National Traffic and Motor Vehicle Safety Act, as amended (Title 49, United States Code, Chapter 301), requires the owner’s vehicle(s) be corrected within a reasonable time after parts are available to you. The Act states that failure to repair a vehicle within 60 days after tender for repair shall be prima facie evidence of an unreasonable time. However, circumstances of a particular situation may reduce the 60 day period. Failure to repair a vehicle within a reasonable time can result in either the obligation to (a) replace the vehicle with an identical or reasonably equivalent vehicle, without charge, or (b) refund the purchase price in full, less a reasonable allowance for depreciation. The Act further prohibits dealers from selling a vehicle unless all outstanding recalls are performed. Any lessor is required to send a copy of the recall notification to the lessee within 10 days. Any subsequent stage manufacturer is required to forward this notice to its distributors and retail outlets within five working days. Copy of Notice to Owners Subject: Thomas Built Bus Roof Sheet Joint For the Notice to Canadian Customers: This notice is sent to you in accordance with the requirements of the Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that a defect which relates to motor vehicle safety exists in certain model years 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022. On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, search online at https://northamerica.daimlertruck.com/contact-us. Scroll down to “Locate a Dealer” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall at the following URL: https://dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you have a safety concern relating to this Recall, you may wish to contact Transport Canada – Motor Vehicle Safety at, 80 rue Noel, Gatineau, Quebec J8Z 0A1 or phone (800) 333-0510. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D Transport Canada #2022-577 (School Bus) Page 4 REVISED NOTICE Copy of Notice to Owners Subject: Thomas Built Bus Roof Sheet Joint For the Notice to U.S. Customers: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that that certain model year 2011-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022, fail to conform to the Federal Motor Vehicle Safety Standard No. 221 “School bus body joint strength.” On the affected vehicles, the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. A body joint on a school bus with insufficient strength may increase the risk of injury in the event of a crash without prior warning. A Daimler Truck North America authorized service facility will add additional mechanical fasteners to the joints on affected vehicles. The Recall will take approximately five hours and will be performed free of charge. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, search online at https://northamerica.daimlertruck.com/contact-us. Scroll down to “Locate a Dealer” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall at the following URL: https://dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If your dealer fails to remedy the defect without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Page 5 REVISED NOTICE Reimbursement to Customers for Repairs Performed Prior to Recall If you have already paid to have this recall condition corrected you may be eligible to receive reimbursement. Requests for reimbursement may include parts and labor. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized Daimler Truck North America LLC dealer. The following documentation must be presented to your dealer for consideration for reimbursement. Please provide original or clear copies of all receipts, invoices, and repair orders that show: • The name and address of the person who paid for the repair • The Vehicle Identification Number (VIN) of the vehicle that was repaired • What problem occurred, what repair was done, when the repair was done • Who repaired the vehicle • The total cost of the repair expense that is being claimed • Proof of payment for the repair (such as the front and back of a cancelled check or a credit card receipt) Reimbursement will be made by check from your Daimler Truck North America LLC dealer. Please speak with your Daimler Truck North America LLC authorized dealer concerning this matter. Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 6 REVISED NOTICE Work Instructions Subject: Thomas Built Bus Roof Sheet Joint Models Affected: Specific model years 2011-2023 school buses manufactured March 1, 2010, through August 1, 2022. Roof Joint Repair 1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires. NOTE: The main power disconnect switch (MPDS) is located in the battery box compartment. 2. Turn the MPDS to the OFF position. 3. Disconnect the negative battery cables at the batteries. NOTE: One reusable fixture kit TBB 240564 is required for campaign completion. Order allocation of Qty = 1 per dealer. If additional kit is needed, contact the Customer Assistance Center at 1-855-639-8686, from 8 a.m. to 5 p.m. Eastern time, Monday through Friday. 4. A marking fixture (template) is used for each type of roof joint repair to locate the position of the additional screws. The three different fixtures, and their applications are listed in Table 3. Fixture Types and their Applications Fixture # Part Number Application Figure Reference Fixture Kit TBB 240564 Kit Includes: Fixture A, B, and C — Fixture A TBB 240418 Used for Standard/Typical Roof Joint Fig. 1 Fixture B TBB 242524 Used for Roof Hatch Joint with One Hole between the Centerline of Vehicle Fig. 2 Fixture C TBB 242525 Used for Roof Hatch Joint with Two Holes straddling the Centerline of Vehicle Fig. 3 Table 3, Fixture Types and their Applications 05/17/2023 f750109 A A. Medium-sized hole located in the center of the fixture. Fig. 1, Fixture A 05/17/2023 f750110 A A. Medium-sized hole located in the center of the fixture. Fig. 2, Fixture B Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 7 REVISED NOTICE 5. If equipped with a roof-top air-conditioning (A/C) system, as shown in Fig. 4, remove the A/C condenser unit to access the roof joint for repair. Is the vehicle equipped with a roof-top A/C system? YES → Follow steps 6 through 10 to remove the roof-top A/C unit. NO → Proceed to step 11. 05/17/2023 f750111 A A. Two medium-sized holes located in the center of the fixture. Fig. 3, Fixture C 05/17/2023 f750106 Fig. 4, Vehicle Equipped with Factory-Installed Roof- Top A/C Unit Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 8 REVISED NOTICE 05/25/2023 f750107 1 1. Huck Rivet Fig. 5, Roof-Top A/C Secured with Huck Rivets 05/25/2023 f750128 1 1. Putty Cartridge with Nozzle Fig. 6, Roof-Top A/C Sealed with Putty Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 9 NOTE: The instructions for the roof-top A/C unit disconnection and removal are for a typical unit. Depending on the configuration of the vehicle being repaired, the instructions may slightly vary. 6. Remove the A/C roof-top guard, if so equipped. 7. Remove the six mounting screws that hold the plastic condenser cover in place. Set the cover aside. 8. Remove the ten Huck rivets that secure the condenser to the roof. See Fig. 5. 9. Loosen the putty that seals the unit to the roof. See Fig. 6. REVISED NOTICE 05/17/2023 f750108 Fig. 7, Roof-Top A/C Plumbing Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 10 10. Check if the A/C unit can be lifted and repositioned. Can the A/C unit be lifted and repositioned? YES → Lift and reposition the AC unit to access the roof joint. NO → Evacuate the refrigerant, and disconnect the roof-top A/C plumbing, shown in Fig. 7. Reposition the A/C unit to access the roof joint. REVISED NOTICE Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 11 NOTE: Some rivets may not be fitted in the exact center. 13. Adjust the left-hand side and right-hand side ends of the fixture to align with the rivets. 05/17/2023 f750112 1 2 3 5 4 6 1. Vehicle Centerline 2. Standard/Typical Roof Joint 3. Left-Hand Side End of Fixture 4. Right-Hand Side End of Fixture 5. Fixture A 6. Roof Joint with Hatch Fig. 8, Standard Joint Repair 05/17/2023 f750113 1 2 A A. Align the center rivet in the medium-sized hole of the fixture. 1. Vehicle Centerline 2. Fixture A Fig. 9, Aligning the Center Rivet, Fixture A 11. To repair the standard roof joint, place the fixture A over the center rivet of the roof joint on the vehicle, as shown in Fig. 8. 12. The center rivet should fit securely in the medium-sized hole, located near the center of each fixture, as shown in Fig. 9. 14. Secure the fixture to the roof using duct tape to prevent movement of the fixture while marking the new hole locations. Make sure not to cover any holes on the fixture with duct tape. REVISED NOTICE NOTICE Do not mark every hole on the fixture. Mark only the holes identified by yellow circles in Fig. 10 and Fig. 11. IMPORTANT: A standard joint should have 28 pilot hole marks. 15. Once the fixture is secured in place, locate the rivets, and follow the arrows shown in Fig. 10 to identify the marking locations. Use a Sharpie marker to mark the pilot holes for drilling the holes in the roof. 16. The center rivet has two marked locations, connected by lines. See Fig. 12. 05/17/2023 f750114 Fig. 10, Identifying the Marking Locations 05/17/2023 f750115 Fig. 11, Pilot Hole Locations 05/17/2023 f750116 Fig. 12, Two Marked Locations Connected to the Center Rivet Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 12 REVISED NOTICE 17. Once all pilot holes are marked, remove the fixture. Make sure the number of markings is equal to 28. 18. Use a 3/16-inch drill bit and a drill stopper along with a corded drill to drill 1/2-inch deep holes in all the marked locations. See Fig. 13. NOTICE Care should be taken while cleaning. Do not damage the paint on the roof. 19. Remove any metal chips, and clean the drilled surface with a brush. 20. Install a screw in each pilot hole. See Fig. 14. Verify that 28 screws are added per joint. 05/17/2023 f750117 Fig. 13, Corded Drill with 3/16-Inch Drill Bit 05/17/2023 f750118 Fig. 14, Installing the Screws along the Joint Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 13 REVISED NOTICE REVISED NOTICE CAUTION Only experienced, qualified persons using proper equipment should attempt repainting or touch-up painting. Incorrect application of chemicals or paint could damage the surface or impair the finish. 22. Re-paint or touch-up wherever required. See Fig. 16. 23. Add caulk on every gap between the roof sheets. 05/17/2023 f750119 Fig. 15, Cleaned Surface 05/17/2023 f750120 Fig. 16, Paint and Brush Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 14 21. Remove any metal chips, and clean the surface with a cloth. See Fig. 15. REVISED NOTICE 25. Fixture B and fixture C are used to repair roof joints that have a roof hatch, as shown in Fig. 18. Depending on the number of rivets at the centerline of the vehicle roof, the appropriate fixture is determined. • If the roof joint has a single rivet at the centerline of the vehicle, use fixture B (TBB 242524). • If the roof joint has two rivets straddling over the centerline of the vehicle, as shown in Fig. 19, use fixture C (TBB 242525). 26. Position the appropriate fixture over the center rivet(s) of the roof joint on the vehicle. See Fig. 18. 05/17/2023 f750121 Fig. 17, Six Fasteners Installed in an Eight-Inch Span 05/17/2023 f750122 1 2 3 1. Vehicle Centerline 2. Fixture B 3. Roof Hatch Fig. 18, Roof Hatch Joint Repair Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 15 IMPORTANT: Any eight-inch span of the seam should have a minimum of six fasteners (including rivets and screws), as shown in Fig. 17. If the number of fasteners is less than six, add additional screws wherever required. 24. Repeat steps 11 through 23 to repair the other standard joints on the vehicle. REVISED NOTICE NOTE: Some rivets may not be fitted in the exact center. 28. Adjust the left-hand side and right-hand side ends of the fixture to align with the rivets. 29. Secure the fixture to the roof using duct tape to prevent movement of the fixture while marking the new hole locations. Make sure not to cover any holes on the fixture with duct tape. NOTICE Do not mark every hole on the fixture. Mark only the holes identified by the arrows and the yellow rectangle in Fig. 20. IMPORTANT: Table 4 shows the number of pilot hole marks to be made for each fixture. 30. Once the fixture is secured in place, locate the rivets, and follow the arrows to identify the marking locations. See Fig. 20. Mark all pilot holes falling in the region identified by the yellow rectangle. Use a Sharpie marker to mark the pilot holes for drilling the holes in the roof. 05/17/2023 f750123 1 3 2 1. Vehicle Centerline 2. Center Rivets Straddling the Centerline 3. Fixture C Fig. 19, Two Rivets Straddling the Centerline 05/17/2023 f750124 Fig. 20, Identifying the Marking Locations Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 16 27. The center rivet(s) should fit securely in the medium-sized hole, located near the center of each fixture, as shown in Fig. 19. REVISED NOTICE 32. Once all pilot holes are marked, remove the fixture. 33. Use a 3/16-inch drill bit and a drill stopper along with a corded drill to drill 1/2-inch deep holes in all the marked locations. See Fig. 13. 05/17/2023 f750125 Fig. 21, Region Showing all Pilot Holes to be Marked, Fixture B 05/17/2023 f750126 Fig. 22, Region Showing all Pilot Holes to be Marked, Fixture C Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 17 31. Mark all pilot holes in the region indicated by ‘MARK EVERY PILOT HOLE WITHIN THIS RANGE.’ See Fig. 21 for fixture B, and Fig. 22 for fixture C. REVISED NOTICE 36. Remove any metal chips, and clean the surface with a cloth. CAUTION Only experienced, qualified persons using proper equipment should attempt repainting or touch-up painting. Incorrect application of chemicals or paint could damage the surface or impair the finish. 37. Re-paint or touch-up wherever required. See Fig. 16. 38. Add caulk on every gap between the roof sheets. IMPORTANT: Any eight-inch span of the seam should have a minimum of six fasteners (including rivets and screws), as shown in Fig. 17. If the number of fasteners is less than six, add additional screws wherever required. 39. After all roof joints are repaired, install the A/C, if so equipped. Evacuate and recharge the refrigerant. 40. Connect the negative battery cables to the battery. 41. Turn the MPDS to the ON position. Repair complete. 05/17/2023 f750127 Fig. 23, Additional Screws Installed Daimler Truck North America LLC Recall Campaign May 2023 FL957A-D NHTSA #22V-762 (School Bus) Transport Canada #2022-577 (School Bus) Page 18 NOTICE While cleaning, be careful not to damage the paint on the roof. 34. Remove any metal chips, and clean the drilled surface with a brush. 35. Install a screw in each pilot hole, as shown in Fig. 23. See Table 4 for the number of screws to be added per joint. Screw Usage Fixture # Description No. of Screws Fixture B Roof Hatch with One Hole on the Centerline 34 Fixture C Roof Hatch with Two Holes straddling the Centerline 36 Table 4, Screw Usage REVISED NOTICE

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The information contained in this letter supercedes and supplements any related policies and procedures in any previously released bulletins, the Warranty Manual, and/or previously released letters. Failure to read or distribute this letter will not exempt addressees from compliance with the information contained herein. Daimler Truck North America LLC REF #: ICI23-025 Effective: 06/27/2023 Release: 06/27/2023 SUBJECT: FL957 – Revised Bulletin This letter is to inform you that a revised bulletin for Recall FL957 Thomas Built Bus Roof Sheet Joint is available on DTNAPortal. Please print and use the revised bulletin for all work under FL957 from this point forward. REVISION: The parts and labor tables have been updated. If you have questions or need further information, contact the Warranty Campaigns Department by submitting an inquiry through the WSC link on DTNAPortal. REF #: ICI23-025 En vigueur: 27/06/2023 Date de sortie: 27/06/2023 OBJET: FL957 – Bulletin révisé Cette lettre a pour but de vous informer qu’un bulletin révisé pour le rappel FL957 Thomas Built Bus Roof Sheet Joint est disponible sur DTNAPortal. Veuillez imprimer et utiliser le bulletin révisé pour tous les travaux sous FL957 à partir de maintenant. RÉVISION: Les tableaux pièces et main d’oeuvre ont été mis à jour. Si vous avez des questions ou avez besoin de plus amples informations, contactez le service des campagnes de garantie en soumettant une demande via le lien WSC sur DTNAPortal. WARRANTY CAMPAIGNS DEPARTMENT P.O. Box 4090 800-547-0712 Portland, Oregon 97208-4090 ATTENTION: Dealer Principal, Warranty Manager, Service Manager, Parts Manager Freightliner Dealers – U.S. and Canada Western Star and Sterling Dealers – U.S. and Canada FCCC Dealers – U.S. and Canada Thomas Built Buses Dealers – U.S. and Canada Direct Warranty Customers – U.S. and Canada Detroit Diesel Distributors Export Distributors If you have questions about this Letter, please submit your inquiry on the Web using the WSC Link on DTNAPortal

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The information contained in this letter supercedes and supplements any related policies and procedures in any previously released bulletins, the Warranty Manual, and/or previously released letters. Failure to read or distribute this letter will not exempt addressees from compliance with the information contained herein. Page 1 of 1 Daimler Truck North America LLC REF #: ICI22-050 Effective: 12/09/2022 Release: 12/09/2022 SUBJECT: FL957 – Interim Recall Notice This letter is to inform you that an interim recall notice is being sent to affected customers for recall FL957 ~Thomas Built Bus Roof Sheet Joint. The interim notices will be mailed by 12/09/2022. A copy follows for your reference. This notice is for your information only. There is no action for customers or dealers to take. If customers inquire, please refer them to the interim notice. If you have questions or need further information, contact the Warranty Campaigns Department by submitting an inquiry through the WSC Link on DTNAConnect. WARRANTY CAMPAIGNS DEPARTMENT P.O. Box 4090 800-547-0712 Portland, Oregon 97208-4090 ATTENTION: Dealer Principal, Warranty Manager, Service Manager, Parts Manager Freightliner Dealers – U.S. and Canada Western Star and Sterling Dealers – U.S. and Canada FCCC Dealers – U.S. and Canada Direct Warranty Customers – U.S. and Canada If you have questions about this Letter, please submit your inquiry on the Web using the WSC Link on DTNAConnect Daimler Truck North America LLC IMPORTANT SAFETY RECALL This notice applies to your vehicle(s), See enclosed VIN list December 2022 FL957 Interim Recall Notice NHTSA #22V762 (School Bus) Subject: Thomas Built Bus Roof Sheet Joint This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that certain 2021-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022 fail to conform to Federal Motor Vehicle Safety Standard No. 221, School Bus Body Joint Strength. The roof exterior joint was manufactured with insufficient strength may separate during a crash and could increase the risk of injury in the event of a crash. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. Daimler Truck is currently securing replacement parts. There is no action for you to take at this time. The second notice will inform you when the final, free remedy is available. When you receive the second notice, please contact your authorized Daimler Truck North America dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Truck North America LLC December 2022 FL957 Interim Recall Notice Transport Canada #2022-577 (School Bus) Subject: Thomas Built Bus Roof Sheet Joint Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses, has decided that certain 2021-2023 Thomas Built EFX and HDX school buses manufactured March 1, 2010, through August 1, 2022 fail to conform to Federal Motor Vehicle Safety Standard No. 221, School Bus Body Joint Strength. The roof exterior joint was manufactured with insufficient strength may separate during a crash and could increase the risk of injury in the event of a crash. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. Daimler Trucks is currently securing replacement parts. There is no action for you to take at this time. The second notice will inform you when the final, free remedy is available. When you receive the second notice, please contact your authorized Daimler Truck North America dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address [email protected]. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you have a safety concern relating to this Recall, you may wish to contact Transport Canada – Motor Vehicle Safety at, 80 rue Noel, Gatineau, Quebec J8Z 0A1 or phone (800) 333-0510. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Truck North America LLC décembre 2022 FL957 Avis provisoire de rappel Transports Canada #2022-577 (Autobus scolaire) Objet: Thomas Built Bus Joint de toiture Daimler Truck North America LLC (DTNA), au nom de sa filiale à part entière, Thomas Built Buses, a décidé que certains autobus scolaires Thomas Built EFX et HDX 2021-2023 fabriqués du 1er mars 2010 au 1er août 2022 ne sont pas conformes à la Federal Motor Vehicle Safety Standard no 221, Résistance des joints de carrosserie des autobus scolaires. Le joint extérieur du toit a été fabriqué avec une résistance insuffisante, peut se séparer lors d’une collision et augmenter le risque de blessure en cas d’écrasement. Il s’agit du premier de deux avis que vous recevrez à ce sujet. La présente vise à vous informer d’un rappel à venir pour corriger le problème susmentionné. Daimler Trucks sécurise actuellement les pièces de rechange. Il n’y a aucune mesure à prendre pour le moment. Le deuxième avis vous informera lorsque le dernier recours gratuit sera disponible. Lorsque vous recevez le deuxième avis, veuillez communiquer avec votre concessionnaire autorisé Daimler Truck North America pour planifier le rappel de votre véhicule. Si vous n’êtes pas propriétaire du véhicule correspondant au (x) numéro (s) d’identification figurant sur l’avis de rappel, veuillez retourner l’avis au Service des campagnes de garantie avec tous les renseignements que vous pouvez fournir pour nous aider à localiser le propriétaire actuel. Si vous avez loué ce véhicule, la loi fédérale exige que vous transmettiez cet avis au locataire dans les 10 jours. Si vous êtes un fabricant à une étape ultérieure, la loi fédérale exige que vous transmettiez cet avis à vos distributeurs et points de vente au détail dans un délai de cinq jours ouvrables. Si vous avez des questions au sujet de ce rappel, veuillez communiquer avec le Service des campagnes de garantie au (800) 547-0712, de 7 h à 16 h, heure du Pacifique, du lundi au vendredi, à l’adresse courriel [email protected]. Pour toute autre question, vous pouvez communiquer avec le Centre d’assistance à la clientèle au (800) 385-4357. Si vous avez des préoccupations en matière de sécurité concernant ce rappel, vous pouvez communiquer avec Transports Canada — Sécurité des véhicules automobiles au 80, rue Noel, Gatineau (Québec) J8Z 0A1 ou téléphoner au (800) 333-0510. Nous regrettons tout inconvénient que cette mesure pourrait causer, mais nous sommes certains que vous comprenez notre intérêt pour la sécurité des véhicules automobiles. SERVICE DES CAMPAGNES DE GARANTIE Enceinte Daimler Truck North America LLC Service des campagnes de garantie C.P. 4090 Portland, OR 97208-4090 800.547.0712 Téléphone

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-762 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : OCT 12, 2022 NHTSA Recall No. : 22V-762 Manufacturer Recall No. : FL957 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 17,613 Estimated percentage with defect : 80 % Vehicle Information : Vehicle 1 : 2011-2023 Thomas Built Buses EFX & HDX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Thomas Built Buses Saf-T-Liner HDX and EFX school buses built with certain roof lap joint configurations and manufactured in the production range listed above. On certain Thomas Built Buses Saf-T-Liner HDX and Saf-T-Liner EFX school buses the adhesive may not have been properly applied in between the steel panels that forms the roof sheet lap joints. If the adhesive is improperly applied, the joint may not meet the joint strength requirement of FMVSS 221 S5.1. Production Dates : MAR 01, 2010 – AUG 01, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : On certain Thomas Built Buses Saf-T-Liner HDX and EFX school buses, the roof exterior joint with improperly applied adhesive was found to not meet the joint strength requirement of FMVSS 221 S5.1. FMVSS 1 : 221 – School bus body joint strength FMVSS 2 : NR Description of the Safety Risk : A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 S5.1 may increase the risk of injury in the event of a crash. Description of the Cause : NR Identification of Any Warning that can Occur : N/A Part 573 Safety Recall Report 22V-762 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Roof Sheet panel Component Description : Roof Sheet panel Component Part Number : 140599 Component Name 2 : Roof Sheet panel Component Description : Roof Sheet panel Component Part Number : 56000857 Component Name 3 : Roof Sheet panel Component Description : Roof Sheet panel Component Part Number : 56000896 Component Name 4 : Roof Sheet panel Component Description : Roof Sheet panel Component Part Number : 56001211 Supplier Identification : Component Manufacturer Name : Thomas Built Bus Address : NR NR Country : United States Chronology : In 2010, Thomas Built Buses (TBB) established a new procedure for the exterior roof sheet lap joint adhesion validated to FMVSS 221 requirements through good engineering judgment and analysis. In 2011, TBB validated the roof sheet joint, performing physical testing against FMVSS requirements, and found that the joints passed with considerable margin. From that time until recently, TBB continued to produce the same design, with the same manufacturing process, and therefore had no reason to believe the joint did not comply with the Part 573 Safety Recall Report 22V-762 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 standards. On September 1, 2022 NHTSA Office of Vehicle Safety Compliance notified TBB that a sample, taken from a Saf-T-Liner HDX school bus that the agency had purchased, failed the FMVSS 221 joint strength test for the exterior roof lap joint. Immediately, on September 2, 2022, based on the testing information provided by NHTSA, TBB began an investigation to evaluate the potential noncompliance, determine the scope, and establish the potentially affected population. September 9, 2022 TBB requested a visit to NHTSA’s test facility to review findings and the test equipment and procedures. On September 22, 2022, TBB visited Applus IDIADA Karco Engineering. In late September, 2022 TBB reviewed data from that visit and conducted additional engineering verification testing that suggested previously-unexpected manufacturing variability in joint strength. On October 6, 2022, TBB promptly decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses HDX and EFX school buses that may be built with roof exterior roof sheet lap joints with improperly applied adhesive, which subsequently may not meet the joint strength requirement of FMVSS 221 S5.1. TBB has received no warranty claims, no field reports, no customer complaints, no information of injury nor fatality, nor any other indication of a noncompliance until NHTSA’s September 2022 notification. Description of Remedy : Description of Remedy Program : Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. The repair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : DEC 10, 2022 – DEC 10, 2022 Planned Owner Notification Date : DEC 10, 2022 – DEC 10, 2022 * NR – Not Reported

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