What was found
FLT#975, BOS-MCO. ' 'DIRTY SOCK" SMELL IN THE COCKPIT ON DESCENT. STARTED AT ABOUT 11,000'. TURNED OFF PACK 1 AND WENT ON OXYGEN. STILL APAERENT IN FLIGHT DECK ON THE GROUND WITH PACK 1 OFF. FLT ATTENDANT IN THE AFT GALLEY ALSO REPORTED A "MUSTY" AND "DIRTY SOCK" ODOR. STATED IT WAS "A BIG CHANGE IN AIR QUALITY; PERFORMED DESCONTAMINATION OF THE ECS PER AMM 21-00-00-615-804. SEE LOG PG 3553749-1 (REPLACED RECIRCULATION FILTERS PER AMM 21-21-41.) FOR RECIRCULATION FILTER REPLACEMENT AND LOG PG 3553749-2 (REMOVED AND REPLACED BOTH OZONE FILTERS PER AMM 21-51-41.) FOR OZONE FILTER REPLACEMENT. APU PLACED ON MEL SEE LOG PG 3553750-1. NO ODOR WAS NOTED. A/C OK TO CONTINUE FOR SERVICE.'