As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN ANTI-ICE DUCT RED CAS MESSAGE AFTER DEPARTURE FROM CLT. AIRCRAFT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE AIRCRAFT AND REMOVED AND REPLACED A HEAT SENSING ELEMENT USING THE AIRCRAFT MAINTENANCE MANUAL. CHECKS WERE PERFORMED USING THE AIRCRAFT MAINTENANCE MANUAL AND NO FURTHER DEFECTS WERE NOTED. AIRCRAFT WAS RELEASED FOR SERVICE.