What was found
AIRCRAFT WAS GROUNDED: SUSPECTED COMPRESSOR STALL ON ENGINE #2. SHORTLY AFTER TAKEOFF WE FELT AND HEARD 3 SUCCESSIVE BOOMS. FIRST OFFICER NOTICED A SLIGHT DECREASE IN N1. IT WAS A TOGA TAKEOFF, APU BLEED ON. ALL PARAMETERS WERE NORMAL AT CLIMB POWER, NO ECAMS RECEIVED. CALLED MOC INFLIGHT,NO ABNORMALITIES NOTED. DURING A REVIEW OF THE DFDR DATA IT WAS NOTED THAT THERE WAS A 3 SECOND UNCOMMANDED ROLL BACK OF N1 ON THE #2 ENGINE. IT WAS ALSO NOTED THAT THE EGT HAD EXCEEDED 970 AND MAINTENANCE ACCOMPLISHED A BORESCOPE OF THE HPT1 AND LPT1. MAINTENANCE FOUND DAMAGE TO THE LPT BLADES THAT WAS WITHIN LIMITS BUT LIMITED TO 10 FH OR 5 FC BEFORE REPLACING THE ENGINE. MAINTENANCE REPLACED THE #2 ENGINE PER TASK CARD 26L40071001.