As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FUEL HEAT VALVE OPEN LIGHT ON NR 2 ENGINE REMAINED BRIGHT BLUE AFTER ENGINE START. AFTER CONSULTING MAINTENANCE, IT WAS DECIDED THAT THE VALVE HAD FAILED IN THE CLOSED POSITION. A/C OPERATED ON MEL FOR CLOSED VALVE. AFTER TAKEOFF, THE OIL TEMPERATURE WAS CLIMBIMG INTO YELLOW ARC. A/C R AIRCRAFT RETURNED. BROKEN WIRES ON FUEL HEAT VALVE CANON PLUG.