As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: A DIRTY OILY RAG SMELL COMING FROM THE AIR VENTS WAS REPORTED BY THE FLIGHT ATTENDANTS DURING BOARDING AND THE ODOR CONTINUED THRU ALL PHASES OF THE FLIGHT. MAINTENANCE FOUND EVIDENCE OF OIL ON THE APU PLENUM INTAKE AREA AND DETERMINED THE APU WAS THE SOURCE OF THE ODOR. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)