What was found
DURING ENGINE START, LT ENGINE START VALVE INOPERATIVE. ACFT RETURNED TO THE GATE (BTB). DEFERRED LT START VALVE IAW MEL 80-00-2-1. MX ACTIONS ACCOMPLISHED PLACARDS INSTALLED A/C REMAINS ETOPS 180. REMOVED AND REPLACED L ENG STARTER VALVE IAW B767 AMM 80-11-02 PLACARDS REMOVED. NO REACTIVATION PROCEDURES APPLIED. A/C REMAINS ETOPS 180 ENGINE START GOOD VALVE LIGHT STAYS ILLUMINATED. DEFERRED L/H ENG START VALVE LIGHT PER MEL 80-00-1-1. PLACARDS INSTALLED A/C REMAINS ETOPS 180. A/C RETURNED TO SERVICE.