What was found
FLT#2133, MCO-SJU. 'STRONG ODOR SOCK SMELL ON DESCENT (MID 20'S TO 10,000) SMELL LESSENED BUT CONTINUED TO GATE F/A ALSO REPORTED SMELL MOST IN AFT; COMPLIED WITH INFORMATION NOTICE 2017-T015L SECTION B2. ODOR IDENTIFIED TO BE COMING FROM PACKS , APU ALREADY DEFERRED. ECS DECONTAMINATION LEVEL B WAS ACCOMPLISHED PER TSM 05-50-00-810-831-A. REMOVED AND REPLACED RECIRCULATION FILTERS AND OZONE FILTERS REF AMM 21-21-41 & 21-51-41. ACCOMPLISHED IDLE RUN IAW AMM 71-00-00 NO ODOR PRESENT. AIRCRAFT IS OK FOR SVC.'