What was found
GSO - FLT 1046 - DURING CRUISE AT APPROXIMATELY FL 290, THE CREW HEARD A LOUD BANG FROM THE LEFT SIDE OF THE ACFT WITH FLUCTUATIONS OF THE LT ENGINE GAUGES. ENGINE INDICATIONS RETURNED TO NORMAL AND THE CREW CONTINUED FLIGHT. SHORTLY THEREAFTER, ANOTHER LOUD BAG WAS HEARD ACCOMPANIED WITH ENGINE VIBRATION AND ADDITIONAL ENGINE INDICATION FLUCTUATIONS. CAPTAIN ELECTED TO REDUCE THE LEFT ENGINE TO IDLE THRUST AND DIVERT TO GSO, THE NEAREST AIRPORT. FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE FOUND THE TURBINE SEIZED ON THE LEFT ENGINE ASSY. REMOVED AND REPLACED THE LEFT ENGINE ASSEMBLY PER JOB CARD. OPERATIONAL CHECK AND LEAK CHECK GOOD. (X)