What was found
FLT 6427 - IAD-ROA - DURING CRUISE, EXPERIENCED A DISCREPANCY WITH THE LT ENGINE OIL PRESSURE FLUCTUATING AND CAPTION LIGHT FLICKERING. AIRCRAFT RETURNED TO IAD AND MAINTENANCE CONTROL WAS NOTIFIED. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AND THE AIRCRAFT WAS MOVED TO THE HANGAR. MAINTENANCE TROUBLESHOT THE SYSTEM AND FOUND THAT THE LEFT ENGINE COMPRESSOR SEAL HAD FAILED. MAINTENANCE REMOVED AND REPLACED THE LT ENGINE COMPRESSOR SEAL AND ACCOMPLISHED ALL APPROPRIATE CHECKS. THE AIRCRAFT WAS RELEASED FOR SERVICE. (M)