What was found
DURING TAXI WHILE STARTING LH ENGINE LEFT ENG DID NOT START, STARTVALVE LIGHT ILLUMINATED ,AC RETURNED TO GATE , MTX GROUNDED AC AND DEFERRED THE START VALVE IAW MEL-ABX-80-00-2-1 , RETURNED AC TO SERVICE AND MANUALLY STARTED ENGINE ,AC DEPARTED . REMOVED AND REPLACED LEFT ENG STARTER CONTROL VALVE IAW B767 AMM 80-11-02. OPS CHECK GOOD. THIS CLEARS DI NUMBER 54790. PLACARDS REMOVED. NO MX PROCEDURES REQUIRED. A/C REMAINS ETOPS 180. PLACARD ROTATED. REF LP 38946-63/1