As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5449 - ON CLIMBOUT FROM CVG TO DTW ANTI-ICE DUCT WARNING MESSAGE CAME ON WITH BOTH, WING AND COWLING ANTI-ICE SELECTED ON IN ICING CONDITIONS. AIRCRAFT RETURNED TO CVG AND LANDED SAFELY. REMOVED AND REPLACED FENWAL LOOP CONNECTOR AT FS 628 RIGHT SIDE.