What was found
SHIP 3313 "DIRTY SOCK" SMELL IN DESCENT AND WITH APU RUNNING. CORRECTIVE ACTION: RMVD BOTH NBR 1 AND NBR 2 ENG H.P. VALVES TO INSPECT FOR OIL CONTAMINATION. NTF. REINSTALLED BOTH 1 & 2 H.HP. VALVES. TROUBLE SHOT. SUSPECT APU DUE TO OIL LEAK REF LOG PAGE 4449409. STARTED DECOMTAMINATION OF ECS PER 21-00. REMOVED BOTH ENGINE START VALVES, REINSTALLED ENGINE START VALVES. RAN BOTH ENGINES & APU TO IDENTIFY SOURCE OF FUMES. NO NOTICABLE SMELL FROM ENGINES. MODERATE SMELL FROM APU. RMVD AND RPLCD FWD AND AFT RECIRC FILTERS. HIGH PWR RUN. C/W NO GO OGI PREVENTION. NO DISCREPANCIES NOTED. (4449408)