As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ENGINE DEVELOPED VIBRATION. REQUESTED DESCENT AND TURN TO NEAREST SUITABLE FIELD. REDUCED ENGINE POWER TO IDLE ON DOWNWIND, FELT A JOLT AND SAW RIGHT ENGINE ACCESS PANEL PUSH OUT. FEATHERED AND SECURED RIGHT ENGINE AND LANDED.