As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RAMP REPORTED BURNING ODOR IN CARGO BAY AREA, WHEN APU WAS STARTED. INSPECTED CARGO BAY. NO EVIDENCE OF SMOKE OR FIRE. FOUND OIL VAPOR COMING FROM APU VENT MAST. SERVICE APU OIL. GROUND RAN APU. OPERATED APU BLEEDS, NO LEAK OR ODOR NOTED. AIRCRAFT OK FOR SERVICE.