What was found
(CAN) WHILE ON A TRAINING MISSION, ABRUPT POWER CHANGES WERE BEING CONDUCTED WHEN COMPRESSOR STALL WAS NOTED ON THE NR 2 ENGINE. THE TRAINING MISSION WAS CANCELLED AND THE ACFT RETURNED TO BASE WITHOUT FURTHER INCIDENT. WHILE TROUBLESHOOTING THE COMPRESSOR STALL CONDITION ON THE NR 2 ENGINE, THE ENGINEER AND PILOT NOTICED A DEGRADING CONDITION REGARDING THE COMPRESSOR STALL. THE NR 2 ENGINE WAS IMMEDIATELY R & R. ENGINE SN LE45771AEF TO BE SENT OUT FOR REPAIR AT THE APPROVED O/H FACILTY.