Most modern FADEC systems make use of something called "Time Limited Dispatch" or TLD. Basically, TLD allows dispatch with loss of redundancy faults that don't directly affect engine operation for some specified time before corrective action needs to be taken (anywhere from a few days to 2,000 flight hours depending on the engine and the nature of the fault).
To determine the fault that is causing the message you'd need to check the maintenance message on whatever Airbus calls their maintenance computer.
However, given you're talking a very new installation (the Leap) it could well be a nuisance message - maintenance would have some notification that if they do some check and it's OK, they can ignore message xyz until it gets fixed in the next FADEC s/w update.