As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, CREW REPORTED RECEIVING AN ENG 1 ANTI-ICE VLV FAIL MESSAGE. WHILE FOLLOWING PROCEDURES, THE CREW DECIDED TO RETURN TO THE DEPARTURE FIELD FOR AN UNEVENTFUL UNSCHEDULED LANDING. MX REPLACED THE ENG 1 ANTI-ICE TRANSDUCER & ANTI-ICE VLV AFTER WHICH ALL OPERATIONAL CHECKS WERE SUCCESSFUL.