TL*THE CONTACT OWNS A 2003 JEEP GRAND CHEROKEE. WHILE THE VEHICLE WAS PARKED AND SHUT OFF, IT BEGAN TO ROLL OUT OFF THE CONTACT'S DRIVEWAY AND ONTO A HILLSIDE FIELD. THE VEHICLE TRAVELED DOWN THE HILLSIDE AND INTO A LAKE, WHERE IT STRUCK SEVERAL LARGE ROCKS IN A SHALLOW PORTION OF THE WATER. THE VEHICLE WAS DESTROYED. THE CONTACT DID NOT NOTICE ANY DIFFERENCES IN THE VEHICLE PRIOR TO THE FAILURE. A POLICE REPORT WAS FILED. THE VEHICLE HAS NOT BEEN DIAGNOSED BY THE DEALER. THE SPEED WAS UNKNOWN. THE CURRENT AND FAILURE MILEAGES WERE 68,000.