What was found
AIR TURNBACK DUE TO NR 2 ENGINE COMPRESSOR STALLED WITH ANTI-ICE ON THROUGH 11000 FEET. TEMPERATURE APPROX 620 DEG. BROUGHT THROTTLE TO IDLE, NR 2 EGT WAS APPROX 70 DEG HOTTER THAN NR 1 AND NR 3, FF 900LBS HIGHER THAN NR 1 AND NR 3. ADVANCED THROTTLE WITH ANTI-ICE OFF AND ENGINE STALLED AGAIN. PERFORMED BORESCOPE INSPECTION IAW MM 72-00-00, FOUND EXTENSIVE DAMAGE TO HIGH PRESSURE COMPRESSOR. REMOVED AND REPLACED NR 2 ENGINE IAW MM PROCEDURES. ENGINE RUN CHECK NORMAL.