As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - INFLIGHT JFK-ZRH. CREW REPORTED LEFT ENGINE BLEED LIGHT ILLUMINATED ON EICAS PANEL IN FLIGHT. FLIGHT DIVERTED LHR LANDED WITHOUT INCIDENT. REPLACED AIR SUPPLY CONTROL VALVE AND PRESSURE REGULATING SHUT-OFF VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.