What was found
FLIGHT 713 ABORTED THE TAKEOFF AFTER THE FLIGHT CREW EXPERIENCED A VIBRATION COMING FROM THE NR 1 ENGINE, THE AIRCRAFT RETURNED TO THE GATE WITHOUT ANY FURTHER INCIDENT. MAINTENANCE INSPECTED THE ENGINES AND FOUND THE NR 1 ENGINE SHOWING EVIDENCE OF DAMAGE TO THE SECOND STAGE COMPRESSOR SECTION, FURTHER INSPECTIONS ARE IN PROGRESS. THE NR 1 ENGINE VISUAL INSPECTION NOTED LOW COMPRESSOR BLADE DAMAGE THROUGHOUT THE ENGINE POSSIBLY FROM FOD, THE NR 1 ENGINE HAS BEEN REMOVED AND REPLACED WITH ANOTHER SERVICEABLE ENGINE.