As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED DURING CLIMB OUT THE RIGHT FUEL HEAT LIGHT ILLUMINATED WITH CORRESPONDING RISE IN OIL TEMPERATURE. ACCOMPLISHED QRH PROCEDURES AND LIGHT REMAINED ON. EMERGENCY DECLARED RETURNED DFW LANDED WITHOUT INCIDENT. FOUND RIGHT ENGINE FUEL HEAT VALVE WAS STICKING PARTIALLY OPEN. REPLACED RIGHT ENGINE FUEL HEAT VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.