As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1620, BOS-LHR. (ETOPS) 'FUEL ACT TRANSFER FAULT MESSAGE APPEARED AGAIN DURING THE CRUISE. FUEL WAS TRANSFERRED MANUALLY PER QRH PROCEDURE THERE WERE 3400 LBS OF FUEL LEFT IN ACT 1 WHEN THE MESSAGE CAME UP ( CAUTION ON ECAM 5) ACT XFR FAULT (ACT) ). PERFORMED OPS TEST OF THE ADDITIONAL CENTER TANK AUTO TRANSFER SYSTEM IAW AMM 28-28-00-710-005-A. OPS TEST IS GOOD. AS PRECAUTIONARY REMOVED AND REPLACED ALSCU IAW AMM 28-46-35. MDDR CLEARED. PLACARD REMOVED. UPDATED MX-4.