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. **ORIGINAL REPORT WAS ALA202208291146** MAINTENANCE REPLACED APU OIL COOLER, REPLACED APU OIL COOLING FAN O-RINGS (AALA202209094454) AND APU OIL COOLING FAN TRANSFER TUBE (AALA202209096343). A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS BEING NOTED