As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUT DOWN DURING START. NOTICED OIL DRIPPING FROM OVERBOARD DRAIN. INVESTIGATION REVEALED APU FUEL CLAMP BOLT FAILED AND FUEL PUMP DISENGAGED FROM ACCESSORY HOUSING. BOLT SHOWED PREVIOUS FRACTURE, POSSIBLE OVERTORQUE. NO DAMAGE TO FUEL PUMP. TORQUE IS SUPPOSED TO BE 25 INCHES/POUNDS.