What was found
FLT#2618, FLL-JAX. 'STRONG LEVEL 3 FUMES/ODOR DIRTY SOCKS. COULD NOT ISOLATE WITH FCOM PROCEDURE. VERY STRONG IN CAB. PAX INFLIGHT & FLT CREW. PAX IN EXIT ROW COMPLAINED &FA SMELL IT IN ROW 15 ( PACKS ); FOUND EVIDENCE OF OIL LEAK FROM COOLING FAN AND CENTER DRAIN TUBE. APU PLACED ON MEL. C/W LEVEL B DECONTAMINATION IAW AMM 21-00-00-615-803B . BOTH HEPA CABIN FILTERS REPLACED PER AMM 21-21-41. NO ODOR PRESENT AFTER . MDDR LEARED MX-4 UPDATED . MCC NOTIFIED . PLACARD REMOVED.'