As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED DUE TO A WING ANTI-ICE PROBLEM THAT DEVELOPED EN ROUTE AND ASSOCIATED NON-ICING RESTRICTION WHICH PRECLUDED LANDING AT PLANNED DESTINATION. AFTER TROUBLESHOOTING FOUND BAD WING ANTI-ICE VALVE. SUSPECT DEBRIS PREVENTED FULL VALVE OPERATION.