What was found
DIRTY SOCK ODOR COMING FROM PACKS WHEN ON ENGINE. CAN SMELL IN FLIGHT DECK AND CABIN. REF AMM 05-51-26-800-801-C1 SMOKE/ODOR IN FLIGHT DECK (EC0500-01013H). ODOR ONLY OCCURS WHEN ENGINES SUPPLYING PNEUMATICS TO SYSTEM, WHEN SWITCHED TO THE APU THE ODOR DISSIPATES. LAS ON THE OVERNIGHT PERFORMED ENGINE WASH AND FIRST FLIGHT OF THE DAY WAS LAS TO LAX. REF. TASK 05-51-26-800-801-C1. PERFORMED PART POWER 70% N1 ON NR 1 AND NR 2 ENGINES WITH APU BLEED OFF, THEN ALTERNATE PART POWER RUNS ON BOTH ENGINES ONE AT A TIME LEFT BLEED ONLY, RIGHT BLEED ONLY WITH BOTH HIGH AND LOW TEMPERATURE SETTING SCENARIOS. WALKED THROUGH CABIN EACH TIME WITH NO DETECTABLE ODORS IN CABIN OR FLIGHT DECK. PERFORMED VISUAL INSPECTIONS IN LEFT AND RIGHT PACK BAYS WITH BOTH PACKS ON. NO DISCREPANCIES NOTED. AIRCRAFT OK FOR SERVICE.