As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) ENGINE CYLINDERS (2OFF) LEAKING PAST EXHAUST VALVE. DURING CYLINDER REMOVAL THE CYLINDER HOLD DOWN NUTS WERE FOUND TO BE LOOSE. RED SILICONE SEALANT WAS ALSO FOUNDS AROUND THE BASE OF THE CYLINDERS AND STUCK TO THE CYLINDER BASE O-RINGS.