As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING DECENT ODOR OF DIRTY SOCKS/OIL FUME SMELL ON FLIGHT DECK. ODOR WAS NOT PRESENT IN PASSENGER CABIN ACCORDING TO FLIGHT ATTENDANTS. **MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)