As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1621, LHR-BOS. (ETOPS) 'REMOVED ENG #1 FAN AIR VALVE ASSY IAW AMM 36-11-54-000-803-A; REPLACED ENGINE #1 FAN AIR VALVE DUE TO EXCESSIVE PLAY IN UPPER BEARING PER TASK CARD A3625040-01, AMM TASK 36-11-54. REF LP 4300580 ITEM 1 FOR OPS CHK.'