October 20, 2023: A project vehicle experienced a loss of motive power while driving along a 5% downhill grade. October 24, 2023: Mack Trucks documents the case in an internal problem resolution system. January 23, 2024: The problem resolution team started their investigation. February 15, 2024: The Product Safety Evaluation committee initiated a PSRI on this issue. May 28, 2024: Findings from the investigation are reviewed by the Product Safety Evaluation Committee and the recommendation is that this be brought to Product Safety Committee. May 30, 2024: The Product Safety Committee meets and decides that a product safety defect exists. The committee also determined that owners must be notified and instructed to not drive their vehicles until repairs have been completed.