As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, FLIGHT ATTENDANT REPORTED A STRONG SMELL LIKE DIRTY SOCKS IN CABIN, PROGRESSIVELY STRONGER WHEN MOVING FROM AFT OF AIRCRAFT TO FORWARD CABIN. SMELL NOT NOTICEABLE IN COCKPIT. SMELL DISSIPATED/COMPLETED ONCE AIRCRAFT LANDED. MAINTENANCE ACCOMPLISHED J/C 03L21021001 AND 03L21021003 AND REMOVED AND REPLACED LEFT AND RIGHT HEPA FILTERS. ALSO, ACCOMPLISHED DUCT CLEANING PER AMM 21-00-01-102-001.