As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED RIGHT ENGINE OVERHEAT VALVE WAS NOT WORKING AND ENGINE OIL TEMPERATURE STAYED IN CAUTION RANGE. RIGHT ENGINE WAS SHUT DOWN AND SINGLE ENGINE TIME WAS EIGHT MINUTES. EMERGENCY DECLARED RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED RIGHT FUEL HEAT TIME DELAY RELAY, MAIN OIL FILTER AND FUEL HEAT VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.