As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO SEVERAL ANTI ICE SYSTEM CASS MESSAGES. CREW REQUESTED LOWER ALTITUDE, OUT OF ICING CONDITIONS, AND EXECUTED THE EMERGENCY CHECKLIST. LANDED WITHOUT INCIDENT. PERFORMED OPERATIONAL TEST IAW ADVISORY WIRE AW300-36-0008 REV 2, NO DEFECTS NOTED. OPS CHECK GOOD.