What was found
DIRTY SOCK SMELL IN COCKPIT AND AFT CABIN ON FINAL APPROACH -9000FT. -PERFORMED OPS CHECK PACK 1 AND PACK 2 WITH APU BLEED NO ODOR PRESENT AND PERFORMED OPS CHECK AT PACK 1 AND PACK 2 WITH ENG 1 AND ENG 2 AND NO ODOR PRESENT IAW TSM 05-50-00-810-831 MOC # 64493 DESCRIPTION OF ODOR/FUMES: PERSISTENT DIRTY SOCKS SMELL. APPARENT CABIN SOURCE:UNKNOWN. FLIGHT DECK. FWD CABIN, AFT CABIN, AND MID CABIN. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.