The front passenger seat caught fire sometime between 3 p.m. on 8/10/14 and 8 a.m. on 8/11/14 when the vehicle was unoccupied, parked, and locked. the fire burned a large hole in the seat. charred debris from the burned seat was found on the front passenger side floor mat. the vehicle was taken to a chevrolet dealer for diagnosis as soon as the burned seat was discovered. the dealer diagnosed the problem as a "seat fire caused by an internal heat source" and offered to replace the front passenger side air bag sensor and seat cushion. *tr