As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MUSTY/DIRTY SOCK SMELL IN CABIN.ODOR STRONGEST JUST AFTER TAKEOFF. FAINT SMELL CONSTANTLY IN CRUISE. NO PASSENGER OR FLIGHT ATTENDANT COMPLAINTS OF NAUSEA/IRRITATION. INITIAL TROUBLE SHOOTING INDICATES THE APU IS THE SUSPECTED CAUSE OF THE ODOR. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)