As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 462 RSW-BOS ON GROUND CHECK, WHILE PERFORMING DEGREASING OF APU ENGINE DURING APU OPERATION, OPEN FLAME WAS DETECTED COMING FROM TOP BURNER CAN AREA. ON SHUT DOWN FOUND CRACK IN CAN AREA. REMOVED AND REPLACED APU. NOTE: HAMILTON SUNDSTRAND CONFIRMED AND REPORTED CRACK IN COMBUSTOR HOUSING ASSY.