As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING A WAI FAIL MESSAGE ON THE EICAS IN ICING CONDITION. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE NR 1 BURST MESSAGE ON THE CMC. THE NR 1 BURST SWITCH WAS REMOVED AND REPLACED, THE SYSTEM OPS CHECKED GOOD FOLLOWING THE REPLACEMENT.