As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW NOTICED STRONG STINKY SOCK ODOR IN FRONT, SLIGHT SMELL IN BACK DURING DESCENT AND WITH APU ON. SMELL GOES AWAY WHEN PACKS ARE OFF. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)