What was found
FLT#1408, (ETOPS) FUEL CLASS II MX MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY 1) FAULT(S) INDICATED BY FUEL ); REMOVED AND REPLACED FUEL-LEVEL SENSING CONTROL UNIT IAW AMM 28-46-34. OPS CHECK GOOD , NO MSG DISPLAYED AT THIS TIME. MDDR CLEAR, PLACARD REMOVED & MX4 UPDATED.