What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL IN CABIN ON TAXI OUT. CLEARED UP AFTER TAKEOFF AND CAME BACK ON FOR TAXI-IN (BUT NOT AS BAD AS TAXI-OUT) NO ONE SICK OR COMPLAINING. JUST NOTICEABLE BY FLIGHT ATTENDANT 1 AND CAPTAIN. REMOVED AND REPLACED AUXILIARY POWER UNIT OIL COOLING FAN (AALA202202150035) PER AMM 49-52-51 AND REPLACED OIL COOLER PER AMM 49-91-44 AND REPLACED COOLING FAN INLET DUCT (AALA202202153099) PER AMM 49-52-51. NO LEAKS NOTED. DUE TO REPEAT SOF EVENTS AUXILIARY POWER UNIT REQUIRES TO BE REPLACED (AALA202202154930). **SUPPLEMENTAL REPORT FOR AALA202202161177 REMOVED AND REPLACE AUXILIARY POWER UNIT PER JOB CARD 26L31049003** (CLOSED)