As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. PILOT REPORTED CABIN SMELLS BAD. MAINTENANCE FOUND OIL LEAKING FROM APU GENERATOR DRAIN PLUG AND THE APU STARTER. MAINTENANCE REPLACED A BROKEN SEAL ON THE APU STARTER AMM 49-42-51 AND REPLACED THE APU GENERATOR PER AMM 24-23-51. A SATISFACTORY LEAK AND OPERATIONAL CHECK WAS ACCOMPLISHED (SEE AALA201712269024 FOR STARTER SEAL).