What was found
DURING DECENT, THE CREW REPORTED A RUMBLE FROM THE RT ENGINE, FOLLOWED BY AN EGT OF 666 DEGREES. THE ENGINE WAS SHUTDOWN, RAN QRH AND THE ENGINE WAS RESTARTED BUT UNABLE TO ADVANCE THROTTLE, ENGINE CONTINUED TO RUN AT IDLE. REMOVED IP CHECK VALVE IAW AMM 36-11-06, FOUND IT POPPED, SHEARED, AND ROTATED 90 DEGREES. SUSPECT HP AIR ENTERING IP COMPRESSOR SECTION CASUSING THE STALL. THE IP CHECK VALVE WAS REMOVED AND REPLACED IAW AMM 36-11-06.