As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND THE ROCKER ARMS REVERSED, INTAKE EXHAUST ROCKERS IN CYLINDER NR 4 LEADING TO POSSIBLE EXHAUST GUIDE AND VALVE DAMAGE DO TO THE EXHAUST ROCKER ARM HAS AN OILING PORT FOR THE EXHAUST VALVE AND THE INTAKE ROCKER ARM DOES NOT HAVE THE OILING PORT. THE ROCKER ARMS WERE REMOVED AND INSTALLED CORRECTLY. DAMAGE TO VALVE AND GUIDE UNKNOWN AT THIS TIME, WILL HAVE TO CONTACT MFG. (K)