As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON TAKEOFF RECEIVED A RED ANTI ICE DUCT MESSAGE. AIRCRAFT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AIRCRAFT AND REMOVED AND REPLACED A FUSELAGE LOOP USING THE AIRCRAFT MAINTENANCE MANUAL. CHECKS WERE MADE USING THE MAINTENANCE MANUAL AND THE AIRCRAFT RELEASED FOR SERVICE.