As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HPSOV EICAS MSG ON. DIVERTED TO LGW. AIR SUPPLY BITE FAULTS HPSOV MCO PER MEL 36-11-02 . REPLACED LT ENG HP VALVE PER MM. UNLOCKED HP VLV AND UNLOCKED T/R ON LEFT ENG. RAN ENG AND VERIFIED HP VLV OPS NML. NO MSGS NOTED. MCO AND PLACARD REMOVED.