As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE FLIGHT MANIFOLD PRESSURE DROP WAS NOTICED. THROTTLE WAS INCREASED BUT PRESSURE WAS STILL DROPPING. A VIBRATION WAS NOTICED IN THE ENGINE AND AIR FRAME. THE ENGINE WAS SHUTDOWN AND SECURED AND A NORMAL LANDING CARRIED OUT. NR ONE CYLINDER ON THE RT ENGINE WAS FOUND TO HAVE ALL THE STUDS BROKEN ON IT EXCEPT FOR THE THROUGH BOLTS. THE CYLINDER HAD PULLED SLIGHTLY AWAY FROM THE ENGINE.