As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ANTI-ICE DUCT RED WARNING EICAS. AT CRUISE FL340. COMPLIED WITH QRH. MESSAGE DID NOT REAPPEARTROUBLESHOT ANTI-ICE DUCT WARNING IN REF TO CRJ 700 FIM 36-21-05. NO DAMAGE FOUND. COULD NOT DUPLICATE FAULT. RAN ENGINES IN REF TO CRJ 700 AMM 71-00-00. PERFORMED PRESSURIZATION OF THE WING ANTI-ICE SYSTEM AND STILL COULD NOT DUPLICATE FAULT. NO HISTORY NOTED. OPS CHECK GOOD AT THIS TIME.