What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING START ENGINES, THE LEFT ENGINE AUTO STAR SYSTEM FAILED. MAINTENANCE PERSONNEL PERFORMED REVISION TO AUTO STAR SYSTEM, DETECTING THE EICAS MESSAGE FAIL, MAINTENANCE CODE 28-19217 AND THE CIRCUIT BREAKER C2822803 POPPED; THE FIM DMC-787-A-28-20-F2-E9A-421A-A PROCEDURE WAS PERFORMED, DETECTING LEFT FUEL SHUTOFF VALVE ACTUATOR FAILED; SO THE LEFT FUEL SHUTOFF VALVE ACTUATOR WAS REPLACED IAW AMM DMC-B787-A-28-22-02-00A-520A-A AND OPERATIONAL TEST WAS PERFORMED IAW AMM DMC-B787-A-28-22-02-00A-720A-A, TESTED CORRECT.