2001 FORD F-150 - PARKED IN GARAGE FOR ABOUT 30 MIN. - FIRE IN LEFT REAR CORNER OF ENGINE COMPARTMENT - CRUISE CONTROL HAD NOT WORKED FOR ABOUT A YEAR - CRUISE CONTROL DEACTIVATION SWITCH RECOVERED, AND EXRAID INTERNAL CONTACTS SHOW SPLATTER FROM ARCING - ADDITIONAL ARCING EVIDENCE ON WIRE HARNESS IN VICINITY OF BRAKE VACUUM BOOSTER.*AK