What was found
FLT 543, EWR-PBI. #4 F/A SMELLED THE DIRTY SOCKS SMELL BEFORE TO OUT OF EWR F/A SAID THE SMELL WENT AWAY BUT SEVERAL PAXS COMPLAINED OF THE SMELL THE SMELL CAME BACK ON DESCENT THE F/A STATED; COMPLIED WITH INFO NOTICIE 2017-T015F SECTION B. APU BLEED PLACED ON MEL 36-12-02B LP 3094198. AIRCRAFT OK FOR SERVICE. T/S ODOR EVENT W/ TSM 05-50-00-810-831-A DISCOVERED APU OVERSERVICED. DESERVICED APU AND CLEANED APU INTAKE, DIFFUSER AND ELBOW. PERFORMED LEVEL A DECOMTAMINATION OF ECS AND REPLACED BOTH RECIRC FAN FILTERS IAW AMM 21-00-00-615-802-A. MEL CLEARED, MCC NOT