As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REMOVAL OF CYLINDER NR 1, INSPECTION OF LIFTERS OF CAM LOBES REVEALED CYLINDER LIFTER FACE CHIPPED OUT CAUSING SCRATCHES ON CAMSHAFT LOBE. THIS AIRCRAFT DOES NOT HAVE A HISTORY OF PROLONGED PERIODS WITHOUT FLYING. ENGINE INSTALLED LESS THAN 3 YEARS AGO. THIS WAS A FACTORY RE-BUILT ENGINE. SUBMITTER STATED IF OPERATION HAD CONTINUED, SEVERE SPALLING WITH LIFTER AND LOBE WOULD HAVE DEVELOPED.