What was found
MUSKY DIRTY SOCK SMELL ON DECENT BETWEEN 15000 AND 10000 FEET. ONLY IN COCKPIT FA'S DID NOT SMELL IT. PERFORMED TSM 05-50-00-810-813-A PROBABLE CAUSE OF ODOR, NR 1 ENGINE PACK NR 1. INSPECTED PACK DUCTS, COMPRESSOR, OZONE FILTERS PER TSM 21-00-00-615A NO OIL CONTAMINATION NOTED. PERFORMED BORE-SCOPE INSPECTION OF NR 1 ENGINE IAW TSM 71-00-00-810-802-A AND AMM 72-31-00-293-002 NO WETTING PRESENT PERFORMED BURN OF BLEED AIR DUCTS IAW TSM 21-00-615-004-A OPERATED PACKS FULL HOT IAW TSM 71-00-00-710-003 NO ODOR PRESENT REPLACED OZONE AND RECIRCULATION FILTERS.