What was found
FLT#1138, AUS-BOS. ' DIRTY SOCK SMELL IN COCKPIT ONLY DESCENDING THRU 7000 FT. THE CABIN CREW SAID THEY DID NOT SMELL ODOR' PER TSM 05-50-00-810-831A REPLACED THE OIL COOLER FAN ON LOG PAGE 3260348 ( REMOVED AND REPLACED APU OIL COOLING FAN ASSY IAW AMM 49-52-51. NO LEAKS NOTED.ALSO CLEANED DUCTS CONNECTION TO FAN ASSY.) AND THE OIL COOLER ON PAGE 3260349 (REMOVED AND REPLACED APU OIL COOLER IAW AMM 49-91-44. NO LEAKS NOTED AT THIS TIME). PERFORMED PACK BERN PER INFO NOTICE 2017-T015F SECTION D RUN PACKS NO ODER NOTED CHECK OK. AND REPLACED RECIRCULATING FILTERS PER 21-21-41.'