Hi,
The warning message indicating that there are some inconsistency in the RAID and the appliance is performing health checks on it to resolve it automatically. This event is part of the regular health check activities in the RAID and should not be too worry about it and not necessarily indicating that is something wrong.
Would suggest to keep monitor it and if you received other RAID event that advising the RAID degraded, would recommend to open TAC case for it to investigate further from the back end of the appliance.
Regards
Handy