As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PISTON REMOVED ALONG WITH CYLINDER NR 3 DUE TO CYLINDER HEAD CRACKS. WHEN INSPECTING PISTON, FOUND PIN PLUG (NON-REMOVABLE, FORGED-IN TYPE) TO BE BROKEN IN MIDDLE WITH ONE END LOOSE. SUBMITTER STATES, OBSERVED THIS TWICE BEFORE ON SIMILAR ENGINES.