As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) EXHAUST VALVE HEAD SEPARATED, STRIKING THE INTAKE VALVE AND CAUSING THE INTAKE VALVE TO FAIL. THE HEAD OF THE EXHAUST VALVE LODGED INTO THE EXHAUST PORT. THE INTAKE VALVE HAD (2) PIECES SEPARATE AND ONE LODGED ITSELF INTO THE TOP OF THE NR 1 CYLINDER HEAD, THE OTHER PORTION MIGRATED TO AN ADJACENT CYLINDER. ALL CYLINDERS WILL BE REMOVED AS COMPRESSION IS LOW ON ALL. (TC NR 20070514024)