TL* THE CONTACT OWNS A 2012 MERCEDES BENZ E350. WHILE THE VEHICLE WAS PARKED AND THE KEY WAS REMOVED FROM THE IGNITION, THE VEHICLE JERKED AND ROLLED BACKWARDS BEFORE STOPPING INDEPENDENTLY. IN ADDITION, THE CONTACT HEARD AN ABNORMAL NOISE AND THE VEHICLE VEERED TO THE LEFT WHEN REVERSING. THE DEALER WAS UNABLE TO DIAGNOSE THE FAILURE BUT MADE THE FOLLOWING REPAIRS: THE COVER ON THE FRONT PASSENGER SIDE CYLINDER HEAD, REMOVED/INSTALLED A SEAL, NON-RETURN VALVE, CHAIN TENSIONER, SEALANT MB, FLANGE GASKET, HEXALOBULAR BOLT, THE COVER ON THE FRONT DRIVER SIDE CYLINDER HEAD, REMOVED/INSTALLED A SEAL, LEFT AND RIGHT SECONDARY DRIVE CHAIN TENSIONERS, FRONT COVER CYLINDER, AND THE CHECK VALVE. ON ANOTHER OCCASION, THE VEHICLE ROLLED IN REVERSE AND CRASHED INTO THE BUMPER OF ANOTHER VEHICLE. THE DOOR OF THE VEHICLE BRUISED THE CONTACT AND MEDICAL ATTENTION WAS REQUIRED. THE VEHICLE WAS TOWED TO THE DEALER. A POLICE REPORT WAS NOT FILED. THE DEALER WAS NOT ABLE TO DIAGNOSE THE FAILURE AND THE VEHICLE REMAINED AT THE DEALER. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 5,597.