What was found
NR 1 ENGINE FUEL HEAT INDICATOR ILLUMINATED IN CRUISE. THE ENGINE OIL TEMPERATURE EXCEEDED RECOMMENDED LIMITS, A PRECAUTIONARY SHUTDOWN WAS ACCOMPLISHED AND THE FLIGHT DIVERTED TO TYS LANDING WITHOUT INCIDENT. MAINTENANCE REPLACED THE FUEL HEAT VALVE, INSPECTED THE CHIP DETECTORS, AND CHANGED THE ENGINE OIL AND FILTER. NO ABNORMAL DEBRIS WAS NOTED. THE ENGINE WAS RUNUP, CHECKED OK, AND SCHEDULED FOR REINSPECTION IN 50 FLIGHT HOURS. AIRCRAFT RETURNED TO SERVICE.