What was found
AFTER AN IDLE POWER DESCENT DURING THE LEVEL OFF & ENG POWER UP, FELT A VIBRATION ALONG WITH A NOISE FROM REAR OF ACFT. RECEIVED AN AMBER ENG VIB R CAS MSG. NOTICED A BURNING OR EXHAUST ODOR IN CABIN. PERFORMED QRH FOR ENG VIB R CAS WHICH LED TO REDUCE POWER. ENGINE VIB STILL FELT & CAS MSG STILL DISPLAYED. FOLLOWED QRH, DIRECTED TO SHUT THE AFFECTED ENG DOWN. PERFORMED A SINGLE ENG LANDING WITH NO FURTHER ISSUES. TROUBLESHOT ENG VIBRATION. TRIED TO TURN FAN (N1) & IT VERY ROUGH TURNING & GRINDING. TRIED TURN N2 THROUGH PMA & WAS LOCKED . CHKD CHIP DETECTOR & FOUND A FEW PIECES OF DEBRIS. INSPECTED 4 DEBRIS MONITORS & FOUND 2 IN THE CENTER OF GEARBOX WITH DEBRIS. REMOVED NR 1 ENGINE. N1 MAKES NOISES WHEN TURNED & N2 DOESN'T ROTATE. IAW WITH AMM 71-00-01 & LMM 72-05-25. INSTALLED AN INSPECTED ENGINE IAW AMM 71-00-01 AND LMM 72-05-25. SERVICED ENGINE. PERFORMED GROUND RUNS FOR LEAK CHECKS AND PERFORMANCE RUN IAW AMM 71-00-01 AND LMM 72-05-25.