CAR WAS PARKED ON A HILL IN GEAR WITH THE EMERGENCY BRAKE ENGAGED. APPROXIMATELY 15 MINUTES AFTER LEAVING THE CAR IT ROLLED 200 FEET DOWN A HILL AND INTO A TREE. CONTACTED THE DEALER ONLY TO FIND THE PART THAT WAS ORDERED TO CORRECT THE PROBLEM THAT HAD PREVIOUSLY BEEN REPORTED WAS ON THE SHELF AND NOT INSTALLED AT THE LAST SERVICE. *AK