Unsure of how fire started but truck was in garage at repair facility and the dash spontaneously caught fire and burned. The truck had been parked for over 48 hours and keys were not in ignition . The truck can be seen on security camera video with a small flash starting in the dash then larger flames inside the cab. It burned for about 3 minutes then the fired died out but not before completely burning the dash . There is security camera footage which was too large to upload.