As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ARRIVAL AND ENTERING ICING CONDITION RECEIVED ANTI-ICE DUCT WARNING MESSAGE. DECLARED EMERGENCY AND DIVERTED TO SB. SYNOPTIC PAGE SHOWS LEADING EDGE LEFT WING RED, EVEN WITH ALL BLEED AIR TURNED OFF AND ON THE GROUND. C/W QRH. AIRCRAFT REMOVED FROM SERVICE. R & R LT WING ANTI-ICE DUCT THERMAL SWITCH S43WK, REF AMM 36-21 AND AMM SUP 11-031. OPERATIONS CHECK GOOD.