What was found
VERY STRONG MUSTY/DIRTY SOCK ODOR ON DESCENT SMELLED ON FLT DECK, ALL FOUR FA'S REPORTED SAME SMELL THROUGHOUT CABIN. DESCRIPTION OF ODOR/FUMES: PERSISTENT, MUSTY DRY/DIRTY SOCKS SMELL. APPARENT CABIN SOURCE: UNKNOWN. FLIGHT DECK, FWD CABIN/GALLEY(LAV), AFT CABIN/GALLEY(LAV), AND MID CABIN/GALLEY(LAV). NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-OPERATED ENG #1 AND #2 WHILE ISOLATING BLEED SYSTEMS 1 & 2 AND PACK SYSTEMS 1 & 2 IAW AMM 71-00-00, NO SMELLS NOTED AT THIS TIME. PERFORMED LEVEL A DECONTAMINATION ECS IAW AMM 21-00-00-615-802-A. A/C OK FOR CONTINUED SERVICE.