What was found
FLT CZ23556 - DURING APPROACH SHENZHENG AT 600M, RT ENGINE MADE SLIGHT SURGING SOUND AND LATER, ELECTRICAL POWER TRANSFERRED. A LOT OF EICAS MESSAGES APPEARED. RT ENGINE UNCOMMANDED SHUT DOWN, ACFT SAFELY LANDED. CHECKED BVCU AND FOUND '04' CODE, TPU HAD '40' CODE. BORESCOPED ENGINE PER MM 72-00-00-601 AND FOUND 6 PIECES OF VANES IN THE THIRD STAGE OF THE HIGH PRESSURE COMPRESSOR DAMAGED, HOWEVER, DAMAGE WAS WITHIN LIMIT. GROUND RAN AND TESTED THE ANTI-SURGE SYSTEM, OK. PUSHED UP THROTTLE TO EPR 1.63, RT ENGINE SURGED. ON 2-8, REPLACED RIGHT ENGINE.