As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CYLINDER SEPARATION OCCURRED IN-FLIGHT. AIRCRAFT PUT ON GROUND SAFELY. SUBMITTER SUGGESTS MORE FREQUENT CYCLINDER INSPECTIONS. THIS IS THE 6TH CYLINDER ASSY OBSERVED HAVING SEPARATIONS SUCH AS THIS. POSSIBLY A 25 HOUR CHECK MIGHT FIND MORE DEFECTS SOONER.