TL*THE CONTACT OWNS A 2006 GMC SIERRA 1500. WHILE THE VEHICLE WAS PARKED ON A NON-LEVELED SURFACE, IT ROLLED BACKWARDS INTO A RIVER. A POLICE REPORT WAS FILED. AFTER INSPECTION, THE CONTACT CONCLUDED THAT THE TRANSMISSION DID NOT ENGAGE ITSELF INTO PARK, WHICH ALLOWED THE VEHICLE TO SHIFT INTO REVERSE. HE IS IN THE PROCESS OF NOTIFYING THE DEALER AND THE MANUFACTURER. THE FAILURE AND CURRENT MILEAGES WERE 54,000. UPDATED 5/7/09 *CN UPDATED 05/12/09.*JB