As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. BHX-JFK FLIGHT DIVERTED TO LHR ACCOUNT LEFT ENGINE HIGH STAGE WARNING INDICATION. OVERWEIGHT LANDING UNEVENTFUL. REMOVED AND REPLACED LEFT HIGH STAGE PILOT VALVE IAW AMM 36-11-08(AALA20170103002) AND LEFT HIGH PRESSURE SHUTOFF VALVE IAW AMM 36-11-07. OPERATIONAL CHECK GOOD.