As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#7, JFK-LHR. (ETOPS). FUEL CLASS II MX MSG ON ECAM ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY 1) FAULT(S) INDICATED BY FUEL ); PERFORMED BITE TEST OF FLSS PER AMM SUBTASK 28-46-00-740-051-H. NO FAULT NOTED AT THIS TIME MX-4 UPDATED PLACARD REMOVED.