What was found
FWD FA'S REPORTED DIRTY SOCK SMELL FROM TOD UNTIL LANDING. CORRECTIVE ACTION: ENGINES 1 AND 2 FOUND MINOR ACCUMULATION OF OIL AT THE FAN SHAFT COVER SEAL. REPLACED FAN SHAFT COVER SEALS, C/W LEVEL B DECONTAMINATION. EVIDENCE OF APU INLET AND/OR PNEUMATIC SYSTEM CONTAMINATION FROM THE APU IS SUSPECT, FWD APU TO MEL 49-10-01A. LATER, INSPECTED APU DUCTING, INLET AND COMPARTMENT NO OIL RESIDUE FOUND. (LP 9130458, 1846741, 9130459 - AIRCRAFT WAS GROUNDED)