What was found
AT GATE, APU MADE EXPLOSION NOISE AND GEN DROPPED OFF LINE, AIRPLANE SHOOK AND EXHAUST SMOKE OBSERVED. PULLED APU FIRE HANDLE. MAINT DETERMINED APU TO BE AN INTERNAL FAILURE, REMOVED APU.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AT GATE, APU MADE EXPLOSION NOISE AND GEN DROPPED OFF LINE, AIRPLANE SHOOK AND EXHAUST SMOKE OBSERVED. PULLED APU FIRE HANDLE. MAINT DETERMINED APU TO BE AN INTERNAL FAILURE, REMOVED APU.