As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED AFTER ONE HOUR OF FLIGHT LEFT ENGINE START VALVE LIGHT ILLUMINATED WITH A "L ENG STARTER CUT OUT " EICAS MESSAGE. EMERGENCY DECLARED FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT. REPLACED LEFT ENGINE START VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.