As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 02078 - NR 2 FUEL TEMPERATURE REACH 60C RAN THE "FUEL TEMPERATURE ABNORMAL" CHECKLIST AND TEMPERATURE REDUCED TO 43C. AIRCRAFT WAS IN DESCENT. MAINTENANCE REPLACED THE NR 2 FUEL HEATER THERMAL ELEMENT IAW QX MTC 9730002. OPERATIONAL CHK GOOD. LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.