What was found
FLT 1201, JFK-FLL. DIRTY SOCK FUMES ODOR PREVALENT IN DESCENT FROM 9000 FT TO LANDING. APU WAS OFF ( APU SYSTEM ) ; R&R BOTH RECIRC FILTERS IAW AMM 21-21-00. ODOR LEVEL DEEMED LEVEL 2 PER TSM 05-50-00-810-831-A. FAULT ISOLATED TO APU BLEED AIR. PERFORMED ECS DECONTAMINATION AIR QUALITY -ACCEPTABLE PER INFO-NOTICE. RAN APU W/PACKS FOR 30 MINS AND RAN BOTH ENGS FOR 15 MINS W/PACKS. NO ODOR NOTED. REPLACED BOTH OZONE FILTERS 100HM 101HM. MDDR CLEARED PLACARD REMOVED MX4 UPDATED MCC ADVISED/ P/N TRANSACTION ON LP 3162246. R/R PACK 1 OZONE FILTERS IAW AMM 21-51-41, OK FOR SVC