What was found
FLT#494, DEN-BOS. 'OIL / DIRTY SOCK SMELL FROM TAKEOFF UNTIL TOP OF CLIMB. SMELL RETURNED DURING DESCENT THROUGHOUT 12,000 AND CONTINUED UNTIL TOUCHDOWN; PER L/P 3291728 ITEM 1 (REMOVED AND REPLACED APU COOLING FAN ASSY IAW AMM 49-52-51) AND ITEM 2 (PERFORMED PACK BURN PER INFO NOTICE 2017-T015F. RUN PACKS, CHECK OK) AND L/P 3291729 ITEM 1 (REMOVED AND REPLACED LH OZONE FILTER IAW AMM 21-51-41. NO LEAKS NOTED) AND ITEM 2 (REMOVED AND REPLACED RH OZONE FILTER IAW AMM 21-51-41. NO LEAKS NOTED) AND 3291730 ITEM 1 (REMOVED AND REPLACED RECIRC FILTERS IAW AMM 21-21-41. NO LEAKS NOTED). RUN APU AND PACKS CHECK OK.