What was found
ON APPROACH TO LANDING, CREW REPORTED A DIRTY SOCK SMELL FROM ABOUT 5,000 FEET UNTIL LANDING. APU WAS OFF AT THE TIME. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE DE-OILER SEAL PER AMM 72-60-31-400-010A. COMPLIED WITH TASK CARDS 26L00021001, 26L00021003 AND 26L00021004.