What was found
DURING CRUISE, THE NR 1 ENGINE BEGAN TO FLUCTUATE, ACCOMPANIED BY ECAM MESSAGE FOR ENGINE COMPRESSOR STALL AND A LOUD BANGING NOISE IN THE CABIN. THE FLIGHT CREW ACCOMPLISHED ECAM ACTIONS FOR ENGINE COMPRESSOR STALL. THE NR 1 ENGINE THRUST WAS REDUCED UNTIL THE STALL CONDITION CEASED. AN EMERGENCY WAS DECLARED. THE FLIGHT CONTINUED TO DESTINATION AND LANDED WITHOUT FURTHER INCIDENT. ACCOMPLISHED BORESCOPE INSPECTION IAW JOB CARD 26L40072006 AND FOUND TEARS IN THE STAGE 3 AND STAGE 8 HPC BLADES. REMOVED AND REPLACED #1 ENGINE PER JOB CARD 26L40071001. LEAK AND OPERATIONAL CHECK GOOD. THE AIRCRAFT WAS GROUNDED.