As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO APU FAILURE WITH RT GENERATOR DRIVE LIGHT INOP. FOD ON LOAD COMPRESSOR. AT ENGINE DISSASSEMBLY FOUND LOAD COMPRESSOR LABRYNTH SEAL ABRADIBLE WITH HIGH WEAR CAUSING POOR PRESSURE BALANCE RESULTING IN HOC WEAR DUE TO VIBRATION FROM FOD.