What was found
(CAN) THE CREW REPORTED THE LT ENGINE SPOOL BACK AND AN UNCOMMANDED SHUTDOWN AFTER 30 MINUTES OF FLIGHT DURING CRUISE AT FL 330. DURING THE SHUTDOWN, THE CREW PERFORMED THE EMERGENCY CHECK LIST AND DESCENDED TO FL210 WHERE THEY PERFORMED A START. THE DURATION OF THE ENGINE EXPERIENCING THE UNCOMMANDED SHUTDOWN TO RE-LIGHT WAS APPROXIMATELY 5-6 MINUTE.AFTER THE ENGINE RE-STARTED IN FLIGHT, NO ABNORMALLY WAS OBSERVED THROUGHOUT THE REST OF THE FLIGHT. TROUBLESHOOTING ON-GOING.