As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE OIL SMELL IN CABIN INBOUND FLIGHT CREW FILLED OUT FORM 46-6020, PERFORMED ENGINE RUN AND APU INDIVDUALLY IN REF TO AMM TASK 05-51-26-800-801-C1, AND FIM 21-00 TASK 806. COULD NOT REPLICATE ODOR ON GROUND, NO HISTORY FOUND PAST 30 DAYS