As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BLEED AIR EXHAUST SMELL IN CABIN ODOR. T/S REF FIM 49-55 TASK 801. PERFORMED VISUAL INSPECTION OF APU AND FOUND RESIDUAL OIL NEAR AIR INLET DUCT. CLEANED AREA THOROUGHLY AND RAN APU WITH BLEED FOR APPROXIMATELY 1 HOUR. COULD NOT REPLICATE ODOR IN AIR. VERIFIED NO LEAKS DURING OPERATION OF APU.