As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2256 AT CRUISE, NR 2 FUEL TEMP 45 DEGREES AND SLOWLY RISING. IN DESCENT TEMP REACHED 54 DEGREES. RAN THE EMERGENCY CHECKLIST AND THE AUX PUMP COOLED IT TO 50 DEGREES AND IT THEN CONTINUED TO RISE REACHING THE RED RADIAL AT LANDING. MAINTENANCE REPLACED THE NR 2 FUEL HEATER THERMAL ELEMENT. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.