What was found
DURING GEAR RETRACTION DETECTED A LOUD REPORT ACCOMPANIED BY AIRCRAFT SHAKING. SHORTLY AFTER, HEARD TWO ADDITIONAL BANGS ALONG WITH JERKING. EGT BEGAN TO RISE, RETURNED RIGHT ENGINE TO IDLE. RE-APPLICATION OF POWER TO RIGHT ENGINE RESULTED IN CONTINUED COMPRESSOR STALL. ENGINE RETURNED TO IDLE, AIRCRAFT RETURNED TO FIELD. 9TH STAGE BLADE FAILURE. REPLACED ENGINE.