What was found
IAD/ROA - FLT 6546 - DURING CRUISE ON 9-1-97 AT 1800 HOURS, RETURNED TO IAD AFTER THE CREW EXPERIENCED A LT OIL TEMPERATURE INDICATION FLUCTUATION BETWEEN 200 DEGREES AND REDLINE INDICATION. ALL OTHER ENGINE INDICATIONS WERE NORMAL. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT UPON ARRIVAL AT IAD AND THE DISCREPANCY WAS TROUBLESHOT TO A FAULTY LT ENGINE TRIPLE GAUGE. MAINTENANCE REMOVED AND REPLACED THE GAUGE IAW THE MM. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (X)