As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN INFLIGHT. SUPPLEMENTAL DATA UPDATE FOUND DRIVEN COMPRESSOR ON APU SCROLL HOUSING P/N 3826140-5, WITH BOLT INSERTS LOOSE AND THREADS DAMAGED. THE BACKSHROUD BOLTS P/N MS9489-27 WERE TORQUED TO SPECIFIC VALUES, BUT STAT-O-SEALS WERE NOT CRUSHED. OIL LEAKED PAST THE STAT-O-SEALS, INTO THE BLEED DUCT AIR STREAM, THROUGH THE IMPELLER DIFFUSER. THE APU AUTO SHUTDOWN FOR LOW OIL PRESSURE.