What was found
(CAN) UNCOMMANDED IN FLIGHT SHUTDOWN DURING CLIMBOUT AT APPROXIMATELY 25,000 FT. PILOT HEARD A LOUD BANG FOLLOWED BY A UNCOMMANDED SPOOL DOWN TO THE RT ENGINE. AN EMERGENCY WAS DECLARED AND A/C RETURNED TO FIELD ACCOMPLISHING A UNEVENTFUL SINGLE ENGINE LANDING. GROUND CHECK REVEALED THAT COMPRESSOR ROTOR COULD NOT BE ROTATED. ENGINE ENROUTE TO ROLLS-ROYCE CANADA FOR INVESTIGATION. RRC HAS BEEN ADVISED THAT THE FAA WILL BE ON SITE FOR THE INVESTIGATION.