What was found
DURING AN APPROACH CHECK FLIGHT, THE NR1 ENGINE OIL TEMPERATURE EXCEEDED ITS NORMAL OPERATING RANGE TO A YELLOW ARC CAUTION OF 113C. THE ACFT DID AN UNSCHEDULED LANDING. MX DETERMINED THE ROOT CAUSE TO BE A FAILED OIL COOLER - AIR OUTLET FLAP ACTUATOR. THE OIL TEMPERATURE EXCEEDANCE WAS DETERMINED TO BE NEGILIBLE IAW THE AMM. UNIT REPLACED AND THE ACFT WAS RETURNED TO SERVICE.