As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ROUGH ENGINE AND SMOKE COMING FROM THE EXHAUST. MAINTENANCE INSPECTED AND FOUND CYLINDER #3 EXHAUST ROCKER ARM PIN RETAINING COVER HAD FALLEN OFF AND PIN HAD MIGRATED OUT, CAUSING ROCKER ARM TO BECOME DISLODGED AND PUSH ROD TO CONTACT ROCKER COVER. METAL CONTAMINATION WAS FOUND IN THE WASTEGATE SOLENOID SCREEN. THE ENGINE IS BEING REPLACED DUE TO METAL CONTAMINATION.