As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5104- EN ROUTE FROM BNA TO JFK RECEIVED ANTI-ICE DUCT WARNING MESSAGE. PERFORMED QRH, MESSAGE PERSISTED. EMERGENCY DECLARED AND AIRCRAFT DIVERTED TO GSO AND LANDED SAFELY. REMOVED AND REPLACED RIGHT SIDE FUSELAGE SENSING ELEMENT (A18WK).