What was found
FA REPORTED A STRONG DIRTY SOCK, GYM BAG ODOR ON DESCENT BTWN 15000-10000. ODOR WENT AWAY WHEN PACK 2 SELECTED OFF. NO DETECTABLE ODOR IN FLIGHT DECK. LAST OCCURRENCE CONFIRMED STRONG SOCK ODOR COMING FROM PACK 2. REMOVED NR 2 ENG INLET DOME COVER, NO OIL FOUND, REINSTALLED, RAN RT PACK WITH BOTH APU & NR 1 ENG, NO ODORS DETECTED, WITH RT PACK RUNNING WITH NR 2 ENG, ODOR RETURNED, BELEIVE ODOR TO BE OIL. ACCOMP BORO INSP IAW AMM 72-00-00-290-828-A. FOUND OIL EVIDENCE IN LPC1,2 & 3. FOUND EVIDENCE OF OIL IN HPC 1, 2, 3, & 4. FOUND EVIDENCE OF OIL LEAKING FROM LPC TO FRONT OF ENGINE. OIL COVERED HPC 1. PLUG AS REQUESTED PER MXC DIRECTIVE, REMOVED NR 2 ENG FAN SHAFT COVER, REPLACED PACKING IAW AMM 72-15-00-960-801-A. NO EVIDENCE OF OIL LEAKING FROM FAN SHAFT COVER. PARTIALLY REMOVED MGB HOUSING BREATHER MANIFOLD (LB30) FOR BORESCOPE ACCESS. PERFORMED BOROSCOPE OF NR 2 ENG IAW TASK CARD 20-0572-8-0051 FOR ENGINE CHANGE. ODOR NO LONGER PRESENT DURING ENGINE RUNS. GOOD TO CONTINUE. ENG REPLACED.