What was found
STALL DISPLAYED ON UPPER ECAM SCREEN DURING CLIMB OR CRUISE ACCELERATION. ENG NOT SHUTDOWN. ENG 1 BETWEEN 20-21K FT ENG1 STALL WITH ROLLBACK.ECAM 1 STALL. DID NOT REOCCUR. ENG OP NORM DUE TO CREW OBSERVATION, FULL TROUBLESHOOTING PER TSM 71-00-00-810-808. NO FOD OR INDICATION OF INTERNAL ENG DAMAGE NOTED AT INLET, EXHAUST & BLEED VALVES. BORESCOPE OF HPC 3 & 4 COMPLETED WITH NO DAMAGE NOTED, HPC STAGE 5 & 6 HAVE MULTIPLE DAMAGE WITH 2 BLADES OUT OF LIMITS & RVI SITE. STAGE 7 STILL NEEDS EVALUATION. REPLACED ENGINE PER JOB CARD 31-7200-9-0001 , ACP ENGINE RUNS WITH NO STALL MESSAGES.