As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 4 CYLINDER ON THE RT ENGINE SHEARED 6 OF THE 8 STUDS IN FLIGHT. ENGINE TIME SINCE O/H IS 1360 HRS. A 500 HRS CYCLINDER BASE NUT TORQUE CHECK WAS CARRIED OUT 360 HRS AGO WITH NO LOOSE NUTS FOUND AND NO ADDITION TORQUE REQUIRED.