As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FAILURE WITH CASE PENETRATION BELIEVED TO BE CAUSED BY A VALVE FAILURE AT THE NR 6 CYLINDER. A TCM ENGINEER WAS ON HAND AT THE TIME AND THE ENGINE HAS BEEN SENT TO TCM FOR TEARDOWN. LEFT ENGINE WAS REMOVED AND REPLACED AS A CORRECTIVE ACTION ON 6/13/2007.