What was found
ETOPS - STRONG DIRTY SOCK SMELL AT TOD IN MAIN CABIN. NO VISIBLE SMOKE. CONCENTRATION FROM ROW 46 TO COCKPIT. LASTED INTERMITTENTLY. ODOR WAS NOTICED AFT FIRST AT TOD, THEN MOVED FORWARD TO THE FORWARD FLIGHT ATTENDENT SEATS. DID NOT NOTICE SMELL IN THE FLIGHT DECK. FOUND OIL IN THE INLET CONE. REMOVED AND REPLACED FAN SHAFT COVER PACKING PER AMM 72-15-00-960-801-A. IDLE RUN GOOD. NO LEAKS NOTED. ACCOMPLISHED CABIN ODOR EVENT ENGINE WASH. DIRTY SOCK SMELL RETURNED. ACCOMPLISED REMOVAL AND INSTALLATION OF #2 ENG PER TASK CARD J321-72-HWI-01 AND 321-72-HWI-02 AND LEVEL C DECON PER TASK CARD E1128-321-21-007. SMELL CHECK GOOD. NO ODOR NOTED. A/C OK FOR SERVICE.