Permobil representative received call from end-user reporting as when they were exiting their transport vehicle via an incorporated ramp, one of the drive motors was reported to have "locked up" yet the remaining motor continued to drive.This reportedly forced the chair to turn quickly to where it rolled off the side of the ramp with the end-user remaining in the seating.Report provided claims the ensuing fall caused the end-user to sustain a fx to their left tibia.It was reported the end-user having had a set of older motor/gearbox assemblies on hand, and that either they or a friend reportedly replaced the suspect motor/gearbox so the end-user to continue use of the device until the new components were ordered and installed.The permobil representative informed the end-user that using an old part was not recommended, but the end-user stated they could not wait for dealer service.Permobil was informed that the suspect motor/gearbox had been discarded by the end-user prior to permobil becoming aware of the event.As suspect components were reported to have been discarded, permobil is unable to evaluate to confirm a product malfunction occurred, therefore are unable to determine a probable root cause without speculation.The dhr was reviewed, and the device was found to have met specification prior to distribution.
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