What was found
(CAN) FLYING LEVEL AT FL 360, PILOT NOTICED A VIBRATION ON THE ACFT, FOLLOWED BY THE MESSAGE RT GENERATOR OFF, GENERATOR RESET PERFORMED AND THE SYS WORKED FOR 3 MINUTES. VIBRATION WAS STILL PRESENT. AFTER 3 MINUTES, THE WARNING FOR RT GENERATOR OFF ACTIVATED AGAIN, AS WELL AS RT OIL PRESSURE LOW. PILOT ELECTED TO SHUT RT ENGINE DOWN AND LAND.