What was found
CABIN ODOR REPORTED FROM ALL FLIGHT ATTENDANT'S, DURING CLIMB BRIEFLY AND FROM TOP OF DESCENT UNTIL TOUCHDOWN. DIRTY SOCK ODOR IN ENTIRE CABIN, PASSENGERS SMELLED ODOR ALSO. COCKPIT CREW WAS NOTIFIED IN DESCENT (ONLY) BY CREW. VERIFIED SAME ODOR, CONTINUATION OF DIRTY SOCK ODOR, WAS STRONGEST IN AFT CABIN. ODOR BEGAN AT TOP OF DESCENT, THRUST IDLE. AFTER TOUCHDOWN, TAXI, SWITCHED TO APU BLEED AND ODOR NO LONGER PRESENT. BOTH PACKS ON ENTIRE FLIGHT. MAINTENANCE FOUND AFT CARGO DOOR SELECTOR VALVE LEAKING. REPLACED AFT CARGO DOOR MANUAL SELECTOR VALVE IAW AMM 52-36-15.