What was found
AT FL310 RIGHT ENGINE OIL TEMPERATURE EXCEEDED 99* CELSIUS FOR MORE THAN 10 MINUTES. PEAKED AT 102* CELSIUS AND WAS STABLE AT 101* CELSIUS WHEN THE RIGHT THROTTLE WAS REDUCED TO IDLE. AT BELOW FL180 THE ENGINE OIL TEMPERATURE RETURNED TO NORMAL RANGE. ENGINE OIL PRESSURE, ITT AND ALL OTHER PARAMETERS WERE IN NORMAL OPERATING RANGE. MAINTENANCE REPLACED THE OIL COOLER THERMOSTAT VALVE. ENGINE SOAP SAMPLE, OIL FILTER AND AGB CHIP DETECTOR CHECK PERFORMED WITH NO DEFECTS NOTED. GROUNDS ENGINE RUNS PERFORMED WITH NO DEFECTS NOTED. A SUCCESSFUL OPERATIONAL CHECK WAS PERFORMED WITH NO DEFECTS NOTED.