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 CLASS II MX MESSAGE ON STATUS PAGE ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY 1) FAULT(S) INDICATED BY FUEL ). PERFORMED BITE TEST OF THE FLSS I.A.W AMM 28-46-00. NO FAULTS NOTED AT THIS TIME. NO CLASS II MESSAGE PRESENT. MDDR CLEARED. MX-4 UPDATED. PLACARD REMOVED.