As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) APU LOAD COMPRESSOR FAILED AT THE GROOVED SECTION OF THE AFT FACE DAMPING RING. COMPRESSOR AND DIFFUSER PIECES HAD EXITED THROUGH THE APU SCROLL CASING SEVERING AN OIL LINE. METAL DEBRIS HAD ALSO PUNCHED A 100MM (4 INCH) HOLE THROUGH THE LOWER APU ACCESS DOOR. PART TC: 16,422.