As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE WING ANTI-ICING FAIL IN ICING CONDITIONS. AIRCRAFT MADE AN UNSCHEDULED LANDING AT DAY. MAINTENANCE INSPECTED AND REMOVED AND REPLACED NR 1 LOW PRESSURE SWITCH AND NR 2 WING ANTI-ICING DISTRIBUTION TUBE BETWEEN THE NR 2 WING ANTI-ICING VALVE AND THE WING ROOT. SYSTEM OPS CHECKED GOOD.