As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1621, LHR- BOS. (AIRCRAFT PERFORMED AN AIR TURN BACK TO LHR). 'AIR ENG 1 BLEED FAULT APPEARED SHORTLY AFTER TAKE OFF . FOLLOWED SOP AND QRH PROCEDURES ATTEMPTED ONE RESET PER FCOM 1 MESSAGE REMAINED . COULD NOT CONTINUE TO ETOPS FLT AND RETURNED TO LAND AT DEPARTURE AIRPORT. ( BLEED AIR SUPPLY SYSTEMS ) ( HIGH PRESSURE VALVES (HPV) ); REMOVED AND REPLACED #1 ENG HP VALVE IAW AMM 36-11-41. OPS CHECK/ LEAK CHK GOOD. MX-4 UPDATED. PLACARD REMOVED.