As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE VIBRATION WHILE IN FLIGHT. AFTER INSPECTION, THE NR 2 ENGINE CYLINDER WAS FOUND WITHOUT COMPRESSION. THE ADMISSION VALVE WAS FOUND INOPERATIVE. A NEW CYLINDER WAS INSTALLED AND SUCCESSFUL ENGINE TESTS WERE CARRIED OUT. THE CYLINDER WAS SENT TO A REPAIR SHOP FOR INSPECTION AND REPAIR (INTAKE VALVE SPRING BROKEN).