As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CYLINDERS REMOVED FOR VALVE LAPPING DUE TO LOW COMPRESSION. LIFTERS FOUND TO HAVE PITTING AND WEAR ON CAM CONTACT SURFACE. CAM LOBES OK BUT SHOWING SOME SIGNS OF WEAR. CAM AND LIFTERS REPLACED WITH NEW. ENGINE TEST RUN OK AND RETURNED TO OWNER.