What was found
IND - FL 247 - FLIGHT DIVERTED TO IND DUE TO HIGH OIL TEMPERATURE READING ON THE NR 1 ENGINE. THE OIL TEMP WENT TO 140 DEGREES CELCIUS, THEN INTO RED BAND AND BACK TO YELLOW. WHEN THROTTLE WAS RETARDED, TEMP WAS IN THE HIGH GREEN BAND. NO EMERG WAS DECLARED AND THE FLT LANDED WITH NO FURTHER INCIDENT. THE NR 1 ENGINE WAS NOT SHUT DOWN. MAINTENANCE REPLACED THE NR 1 ENGINE OIL/FUEL HEAT EXCHANGER AND THE OIL TEMP BULB PER THE MM. DRAINED AND REFILLED OIL TANK. RAN ENGINE. OP CHECK AND LEAK CHECK GOOD. REFERENCE USAASB96170.