What was found
(CAN) ON DESCENT FROM FL470, THE CREW NOTICED A PULSATING VIBRATION WHICH WAS FELT THROUGHOUT THE ACFT. THE AUTO-THROTTLE DISENGAGED AND THE CREW PRESSED THE EVENT BUTTON BEFORE MANUALLY RETARDING THE NR 1 ENGINE TO IDLE. THE ENGINE HAD AN APPARENT FLAMEOUT FOLLOWED BY IGNITION "ON" AND AUTO RELIGHT. ENGINE BEHAVIOR AFTER RE-LIGHT WAS NORMAL AND THE FLIGHT CONTINUED WITH NO FURTHER PROBLEMS. TROUBLESHOOTING IS ON-GOING.