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 WARNING MESSAGE, WITH THE RT FUSELAGE INDICATING RED, AFTER DEPARTURE FROM TYS EN ROUTE TO CLT. AIRCRAFT DIVERTED TO TRI 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.