As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED: SMOKE FUMES ODOR IN CABIN FUEL OIL AND MUSTY SMELL AFTER NR 2 ENGINE START APU SHUTDOWN DURATION APPROX 7 MINS. REMOVED AND REPLACED APU TURBINE CAVITY SEAL HOUSING AND O-RINGS PER MM 49-91-53 OPS GOOD, NO LEAKS NOTED.