What was found
DESCENDING THROUGH 7000 FT SMELLED A DIRTY SOCK ODOR IN-FLIGHT, CABIN AND FLIGHT DECK ODOR SEEMED TO DECREASE BELOW 5000 FT. APU WAS OFF; PREVIOUS HISTORY OF INFO NOTICE COMPLIED WITH. ACCOMPLISHED VISUAL INSPECTION OF THE NR 2 ENGINE. FOUND OIL STAIN ON LOWER BLADE, 6 O'CLOCK POSITION. REMOVED INLET CONE, FOUND OIL RESIDUE. IAW TSM , R & R SEAL ON THE NR 5 BEARING LP TURBINE SHAFT IAW AMM 72-51-41. IAW TSM 05-50-00-810-831. ACCOMPLISHED IDLE RUN NO LEAKS EVIDENT. BOTH PACKS ON, NO ODOR IN CABIN.