As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAKEOFF, PILOT REPORTED POWER LOSS AND ROUGH RUNNING ENGINE. INVESTIGATION FOUND NR 3 CYLINDERS EXHAUST VALVE SEIZED. THIS WAS 4TH OCCURENCE SINCE NEW (1999). INSTITUTED 300 HOUR VALVE GUIDE REAM AND 25 HOUR OIL CHANGE. MFG DENIED REQUEST TO INCREASE VALVE GUIDE CLEARANCE.