As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW MADE A NORMAL APU START REQUEST, A FEW SECONDS LATER HEARD A LOUD BANG AND GOT THE APU FAIL ADVISORY LIGHT. APU ENCLOSURE SUFFERED STRUCTURAL DAMAGE AFTER FUEL VAPOR IGNITED. NO FIRE LIGHT OR FIRE NOTED. EXAMINATION OF APU COMPARTMENT AREA REVEALED THAT APU ACCESS DOORS DEPARTED THE TAILCONE. TAIL CONE TO BE REPLACED. (TC NR 20070314017)