As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5663 DCA/CLE DIVERTED TO CMH DUE TO MAINTENANCE. IN FLIGHT WHILE ON DESCENT INTO CLE ANTI-ICE CAUTION MESSAGE ALERT. CREW RAN QRH AND CAUTION MESSAGE EXTINGUISHED IN FLIGHT. / CREW DECIDED TO CONTINUE DIVERSION AFTER CAUTION MESSAGE EXTINGUISHED. C/W OPS TEST OF WING A/I CONTROL & IND IAW CRJ 200 AMM 30-12-00-710-801. OPS CHECKS GOOD AT THIS TIME"