What was found
CABIN ODOR AT LEVEL OFF, 4000 FT, HP BLEEDS OPEN AND THRUST NOT AT IDLE ,DIRTY SOCK ODOR BECAME STRONG AND WAS DISAPATED AFTER PACK 1 TURNED OFF. VERIFIED SOURCE OF ODOR, DISAPPEARS AFTER PACK NR 1 WAS TURNED OFF. SECURED PACK FLOW VALVE CLOSED IAW AMM TABLE 21-51-00. R & R THE NR 1 PACK REHEATER AND OZONE CONVERTER. R & R THE NR 1 ENGINE. PACK BURN PERFORMED AND NO ODOR IN CABIN OR COCKPIT.