As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED A FUME EVENT IN THE CABIN DURING PASSENGER BOARDING. REPORTS OF MUSTY, BURNING OIL ODOR. MAINTENANCE TROUBLESHOT AND FOUND APU WITH EXTERNAL OIL LEAK BEING INGESTED INTO INLET. DUCT CLEANING AND PACT BURNOUT COMPLETED. OK FOR SERVICE.