As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECIEVED AN ANTI-ICE DUCT WARNING MESSAGE IN FLT. LEFT WING LEADING EDGE RED ON SYNOPTIC PAGE. OCCURED ON APPROACH. THROTTLE MID RANGE. INDICATIONS INITIALLY CLEARED WHEN ANTI-ICE SELECTED TO OFF THEN TO STANDBY. MESSAGE INDICATION RECURRED AFTER SEVERAL MINUTES WHILE IN STBY. DIVERTED. AND LANDED.