What was found
CREW REPORTS ON APPROACH "SOCK" SMELL IN COCKPIT. CREW FOLLOWED QRH AND ISOLATED SMELL TO PACK 1. FA'S DID NOT NOTICE ANY ODOR. MAINTENANCE ACCOMPLISHED TSM 05-50-00-810-831-A BASED ON COSRS FORM. ID'D ENG 1 AS PROBABLE CAUSE. ACCOMPLISHED TSM 71-00-00-810-802-A STEPS 1-4A. PERFORMED 15 MIN IDLE RUN LEAK CHECK IAW AMM 71-00-00-790-002. NO LEAKS NOTED. INSPECTED APU COMPARTMENT AND INTAKE DUCT PER AMM 49-00-00-790-003-A. NO OIL OR FUEL LEAKS NOTED AT THIS TIME. PERFORMED BORESCOPE INSP ENG NR 1 IAW AMM 72-31-00-290-002-A. FOUND NO OIL WETTING. MAINTENANCE PLACED NR 1 PACK ON MEL. AC RELEASED FOR SERVICE.