What was found
CLT - FLT 5121 - AFTER TAKEOFF LEFT ENGINE OIL TEMP WENT INTO THE RED ARC. AIRCRAFT RETURNED TO CLT FOR AN UNEVENTRUL LANDING. MAINTENANCE WAS THEN DISPATCHED TO THE AIRCRAFT. THE EFFECTED ENGINE WAS TROUBLE SHOT AND THE LEFT OIL COOLER THERMOSTATIC BYPASS WAS REPLACED. THE ENGINE WAS THEN GROUND RAN AND ALL OIL TEMPERATURE INDICATIONS WERE NORMAL. THE AIRCRAFT WAS THEN RETURNED TO SERVICE. (M)