As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FINAL APPROACH THE CABIN CREW REPORTED THAT THE CABIN WAS FILLING WITH SMOKE AND PASSENGERS WERE COMPLAINING OF THE SMELL. LAVATORY SMOKE DETECTORS DID NOT GO OFF. NO EMERGENCY WAS DECLARED AND THE ACFT ARRIVED AT THE GATE WITH NORMAL OPERATIONS AND NO SMOKE PRESENT IN CABIN. MX FOUND LT WATER SEPARATOR SOCK FROZEN SOLID. ALSO, FOUND LT 35 DEGREE VALVE NOT OPENING. VALVE WAS DEFERRED. R & R BOTH SOCKS IAW MM. RAN BOTH ENGINES AT POWER AND VERIFIED NO SMOKE OR ODOR FROM PACKS. LEAK CHECK GOOD.