As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5450- EN ROUTE FROM CVG TO GRR RECEIVED ANTI-ICE DUCT WARNING MESSAGE. PERFORMED QRH, MESSAGE WENT OUT, WING ANTI-ICE WAS TURNED TO STANDBY AND AIRCRAFT RETURNED BACK TO CVG AND LANDED SAFELY. REMOVED AND REPLACED RIGHT FUSELAGE SENSING ELEMENT.