What was found
C/W NR 2 ENGINE STALL INSPECTION IAW AMM 71-00-00-200-805-G00. PILOT OBSERVED VSV LAG WITH FUEL FLOW ON ONE OCCURANCE WITH LOSS OF THRUST , ON SECOND OOCCURANCE NOTED VSV LEAD ON FUEL FLOW . AT TIME OF OCCURANCES ALTITUDE WAS AT 35000 CLIMBING TO 36000. REPORTED SEVERE COMPRESSOR STALL . INITIATED DESCENT ON CONTROL FLT THRUST STABILIZED & RECOVERED TO FLT IDLE.. PERFORMED INSPECTION ON OIL DEBRIS MONITORING SYS SENSOR, SCAVENGE SCREEN PLUG, & ENGINE STARTER MAGNETIC PLUG WITH NO FINDINGS. WHILE PREFORMING BOOSTER BLADE BOROSCOPE INSPECT OF NR 2 ENGINE FOUND MULTIPLE BOOSTER ROTOR BLADES ON STAGE 3 & 4 CRACKED, TEARS & MISSING MATERIAL DAMAGE BEYOND LIMITS. R & R NR 2 ENGINE IAW AMM 71-00-02.