As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN CRUISE FLIGHT ENGINE STARTED TO RUN ROUGH AND UNABLE TO MAINTAIN POWER ABOVE 1800 RPM. PILOT LANDED WITHOUT PROBLEMS. ON INVESTIGATION NOTICED NR 2 CYLINDER EXHAUST VALVE STUCK OPEN ALSO NOTICED VALVE TAPPET BODY CRACKED. ENGINE WAS REMOVED FOR REPAIR. TAPPET BODY P/N SL72877