As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5623 - EN ROUTE CVG-CHA, RECEIVED AN ANTI-ICE DUCT WARNING MESSAGE, FLIGHT DIVERTED TO MEM. PERFORMED AN INSPECTION OF THE 14TH STAGE BLEED LINES AND LOOPS, NO DEFECTS NOTED. PERFORMED GROUND RUNS AND AN OPERATIONAL CHECK OF THE ANTI-ICE SYSTEM. DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE.