What was found
FUMES ODOR DURING CLIMB , ISOLATED BLEED 1 AND ODOR DISEPATED UNTIL DECENT THEN ODOR RETURNED EVEN MORE SEVERLY. PERFORMED OPS CK OF THE PACKS SYS REF AMM 21-63-00. NO DEFECTS NOTED ON EITHER PACK , NO CABIN ODOR DETECTED ON EITHER PACK.