As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW LT OIL TEMPERATURE ROSE TO 149 DEGREES & FUEL TEMPERATURE ON LT ENG WAS AT 88 DEGREES. FOLLOWED QRH PROCEDURE & SHUT DOWN LT ENG SINGLE ENGINE TIME 18 MINUTES. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. REPLACED LT ENG FUEL HEAT VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION CLOSED.