TL*THE CONTACT OWNS A 2006 MERCURY GRAND MARQUIS. WHILE DRIVING AT APPROXIMATELY 30 MPH, THE VEHICLE SUDDENLY ACCELERATED UP TO 50 MPH ALTHOUGH THE CONTACT DEPRESSED THE BRAKE PEDAL. THE VEHICLE WOULD NOT SLOW DOWN EVEN AFTER THE CONTACT TURNED OFF THE IGNITION AND CONTINUED TO COAST UP THE HILL UNTIL IT CRASHED INTO A CURB. THERE WERE NO INJURIES BUT A POLICE REPORT WAS TAKEN. THE VEHICLE WAS TOWED TO A LOCAL REPAIR SHOP WHERE IT WAS REPAIRED. AFTER THE REPAIR, THE DEALER PERFORMED A DIAGNOSTIC TEST ON THE VEHICLE BUT NO FAILURE WAS FOUND. THE CONTACT CALLED THE MANUFACTURER AND WAS TOLD THAT THEY WOULD GET BACK WITH HIM FOR AN INVESTIGATION. THE CURRENT AND FAILURE MILEAGES WERE 30,351.