As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, NR 3 CYLINDER INDICATED ZERO. LEAKING PAST VALVE. REMOVED EXHAUST NOTED SPLIT EXHAUST GUIDE. REMOVED CYLINDER, SHIPPED FOR REPAIR AND SUBMITER NOTIFIED THAT CYINDER WAS NEW. ALL FOUR CYLINDERS WERE BOUGHT NEW FROM LCY THROUGH A VENDOR AND SHIPPED TO THE SHOP WHICH INSTALLED THE CYLINDERS AS A SET.