As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, CREW REPORTED RECEIVING A WING ANTI-ICE FAIL MESSAGE ON THE EICAS WHILE FLYING IN ICING CONDITIONS. MAINTENANCE PERFORMED AN OPERATIONAL CHECK OF THE ANTI-ICING SYSTEM WITH NO DEFECTS NOTED. DISCREPANCY COULD NOT BE DUPLICATED.