What was found
NR 2 ENGINE VIBRATION AT 5.0 DESCENDING THROUGH FL200. VIBE COULD BE FELT AND INCREASED WITH ENGINE POWER. LEVELING AT 16000' AND AS POWER CAME UP HEARD WHAT SOUNDED LIKE 2 ENGINE COMPRESSOR STALLS. ALL INDICATIONS NORMAL EXCEPT FOR NR 2 ENGINE VIBRATION 5.0 AT ALL SETTINGS. ACCOMPLISHED STALL, INSPECTION IAW AMM 72-00-00-206-050-J00. METAL FOUND IN TAIL PIPE AND ON MASTER CHIP DETECTOR. BORESCOPE OF HPC ACCOMPLISHED IAW AMM 72-00-00-206-001-J00 AND FOUND DAMAGE TO THE 1ST, 6TH, 7TH AND 12TH STAGES. AIRCRAFT AOG AND CURRENTLY ARRANGING ENGINE CHANGE FOR CURRENT GROUND TIME.