As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED POWER LOSS OF MAX RPM 1600. INSPECTED POWERPLANT, FOUND NR 3 CYLINDER HAD NO COMPRESSION. PULLED CYLINDER, FOUND EXHAUST VALVE BROKEN. TOP OF PISTON AND CYLINDER HEAD DAMAGED BADLY. SUSPECT VALVE FATIGUE AS CAUSE OF FAILURE.