As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED LT ANTI-ICE DUCT WARNING MESSAGE IN-FLIGHT WITH WING ANTI-ICE SELECTED TO NORM. SYNOPTIC PAGE SHOW LT FUSELAGE RED. C/Q QRH. MESSAGE CLEARED. ON DESCENT, USED WING A/ICE IN STANDBY. MESSAGE DID NOT REAPPEAR. ***AIRCRAFT REMOVED FROM SERVICE*** PERFORMED OPS CHECK OF A/I DUCT WARNING SYSTEM PER CRJ 200 AMM 36-21-00. OPS CHECK GOOD.