What was found
DURING CLIMB OUT AT APPROXIMATELY 15,000 FT MSL, THE FUEL TEMP ON THE NR 2 ENGINE WENT FROM NORMAL TO +99 AND TURNED RED WITH THE BELL SOUNDING LIKE THE ENGINE FIRE BELL WAS ON CONTINUOUSLY. AFTER APPROXIMATELY 2 MINUTES THE FUEL TEMP WENT BACK TO NORMAL AND THE BELL QUIT. THERE WERE NO OTHER INDICATIONS OF A PROBLEM. DURING THE TIME THE FUEL TEMP WAS HIGH. ACCOMPLISHED THE EMERGENCY CHECKLIST WITH NO CHANGE IN THE TEMP INDICATION. LANDING UNEVENTFUL. AIRCRAFT REMOVED FROM SERVICE. RAN NR 2 ENGINE WITH NO FAULTS. STARTED NR 1 ENG WITH NR 2 ENGINE RUNNING, DASHES APPEARD FOR NR 2 FUEL TEMP OIL PSI IO, NR 2 FAILED MESSAGE ON ED. REMOVED AND REPLACED THE NR 2 IO MODULE IAW MTC 6314101. OPS TESTED GOOD DURING ENGINE RUN. RETURNED TO SERVICE.