As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE OPERATOR INCURRED AN IN-FLIGHT FAILURE. INSPECTION REVEALED VALVE SEAT FAILED. SUBMITTER STATED THIS UNIT WAS NOT REPLACED DURING LAST OVERHAUL BECAUSE LYCOMING SB 447A FAILED TO LIST LTO-360-E1A6D AS AN EFFECTED ENGINE. SUBMITTER STATED AD 80-14-07 NEGLECTED TO ADDRESS THIS ENGINE MODEL POSSIBLY IN ERROR.