What was found
OIL ODOR ON DESCENT. ACCOMPLISHED SMOKE AND FUME FAULT ISOLATION, IAW KA FIM 21-00-00 TASK 810 UP TO STEP J. FURTHER INSPECTION REQUIRED, REF TO LOG PAGE 703-7068 ITEM 1 OIL ODOR ON DESCENT. ACCOMPLISHED SMOKE AND FUME FAULT ISOLATION, IAW KA FIM 21-00-00 TASK 810 STEP K. NO DEFECTS NOTED, NO ODOR NOTED, OK FOR SERVICE. ACCOMPLISHED AMM 05-51-56. NR 2 PACK COALESCER BAG FOUND CONTAMINATED. REMOVED AND REPLACED COALESCER BAG, IAW KA B747-400 AMM 21-51-25, NO LEAKS DETECTED. OKAY FOR SERVICE. NEED REMOVE PNEU DUCT AT LEADING EDGE BETWEEN NR 1 ENGINE AND NR 2 ENGINE FOR INSPECTION. REMOVED 2 EA PNEU DUCTS FROM LEADING EDGE LT WING, NO OIL CONTAMINATION FOUND REINSTALLED PNEU DUCTS, IAW AMM 36-11-01. PER COMPANY REQUEST NEED TO DRAIN NR 1 ENGINE GEAR BOX AND MEASURE OIL QTY. DRAINED NR 1 ENGINE GEAR BOX AND MEASURED OIL QTY TO BE 2 QUARTS, IAW AMM 79-21-10. DRAINED 2 QUARTS FROM NR 1 ENGINE MAIN OIL TANK, IAW AMM 12-22-03. RECHECKED OIL QTY, IAW AMM 12-13-03. NEED TO REMOVE NR 1 ENGINE PRV AND CHECK PNEU DUCTS FOR EVIDENCE OF OIL. REMOVED NR 1 ENGINE PRV, IAW AMM 36-11-19, NO EVIDENCE OF OIL FOUND, REINSTALLED PRV IAW AMM 36-11-19.