What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK ODOR REPORTED BY ALL FA'S AND SEVERAL PAX. SMELL DETECTED IN FWD, MID, AND AFT CABIN. DURATION 5 MINUTES ALTITUDE 3500 MSL DURING APPROCH. APU OFF. / T/S PER TSM 05-50-00-810-831-A AND PERFORMED TC A32X-21-00-001 SMELL REPRODUCED WITH APU BUT NOT WITH ENGINES.C/W LEVEL 2 ODOR EVENT TASK CARD 21-000-002. COMPLIED WITH PHASE 3 OIL TYPE SMELL WORK CARD NO 21-000-003 COMPLETED.