As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) INLET VALVE SPRING UPPER SEAT WAS AN INCORRECT PART. THE SEAT WAS AN EXHAUST VALVE UPPER SEAT, BUT WAS ETCHED WITH THE PART NUMBER FOR THE INLET VALVE SPRING. THE INCORRECT ITEM WAS PART OF A NEW CYLINDER KIT P/N 05K21117. UNAPPROVED PART.