What was found
DESCENDING THROUGH 12,000 FEET, ON APPROACH. A DIRTY SOCK ODOR WAS INTENSE. TURNED THE NR 1 PACK OFF AND HAD NO EFFECT ON THE ODOR. TURNED THE NR 2 PACK OFF, IT ALSO HAD NO EFFECT ON THE ODOR. DURING VISUAL INSPECTIONS IAW TSM 05-50-00-810-831-A, FOUND HAT IN THE PACK 2 RAM AIR INLET / INLET BYPASS DUCT. REMOVED HAT AND INSPECTED PACK 2 RAM AIR INLET / INLET BYPASS DUCT IAW AMM 21-58-61-000-802-A / 400-802-A AND FOUND TO BE GOOD AT THIS TIME. RAN ENGINE 1 AND ENGINE 2 ISOLATING PACK 1 AND PACK 2 ON ENGINE BLEED 1 AND ENGINE BLEED 2. CABIN ODORS ISOLATED...