What was found
THE NUMBER ONE ENGINE OIL TEMPERATURE EXCEEDED THE LIMIT DURING FLIGHT, INDICATING A READING OF 131 DEGREES CELSIUS. FOLLOWED THE EMERGENCY PROCEDURE AND ATTEMPTED TO INCREASE THE AIRSPEED, BUT DID NOT BRING ENGINE TEMPERATURE DOWN TO NORMAL LIMITS. PLACED ENGINE IN IDLE, & THE TEMPERATURE DECREASED TO THE NORMAL RANGE. CONTINUED THE FLIGHT AND LANDED AT KMPG WITH NR 1 ENGINE AT IDLE. UPON LANDING, ACFT APPEARS TO BE UNDAMAGED. AIRCRAFT HAS BEEN RETURNED TO REVENUE SERVICE, REF # MEC-015940. REPLACED #1 ENGINE OIL COOLER BYPASS VALVE, COMPLETED AIRCRAFT W&B, MULTIPLE AAIP INSPECTIONS, RII CHECKLIST, DEFERRED #1 OAT SENSOR PER MEL 3110-01, AP PASSED SELF-TEST, THIS CLEARS MEL 2210-02.