As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACKS IN THE HEADS ABOVE THE INTAKE PORT IN BOTH CYLINDERS. FUEL STAINING ON THE EXTERIOR OF THE HEAD. THIS IS THE THIRD AND FOURTH CYLINDERS THAT HAVE BEEN REPLACED ON THIS ACFT. THE EARLIER ONES WERE DONE ON 10/19/15 WITH 379 HOURS ON THE PARTS.