As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH APU RUNNING, WITHOUT GROUND POWER UNIT, ELECTRICAL BURNING ODOR AND SMOKE COMING FROM CARGO BAY / APU AREA. INSPECTED AND FOUND APU STARTEF GENERATOR TO BE THE CAUSE OF SMOKE AND FUMES. NO DAMAGE NOTED. REMOVED APU STARTER GENERATOR AND FOUND OIL SOAKED. SUSPECT OIL LEAKING PAST REDUCTION DRIVE ASSY END SEAL OUTPUT SIDE.