What was found
(CAN) NR 1 ENGINE FAILURE. PASSING 12,300 FT, ON CLIMB AFTER DEPARTING CREW, HEARD A LOUD NOISE, FOLLOWED BY A VIBRATION IN THE NR 1 ENGINE, LT ENGINE VIB CAS MESSAGE. ENGINE WAS BROUGHT BACK TO IDLE, CAS MESSAGE EXTINGUISHED AND ACFT DEVERTED. LANDING WAS UNEVENTFUL. ON INITIAL INSPECTION AFTER LANDING, SIGNIFICANT DAMAGE WAS FOUND ON 4TH STAGE LPT BLADES. ENGINE REPLACED AND ACFT RETURNED TO SERVICE.