As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) VIBRATION ON RT ENGINE WITH FIRE, ENGINE FEATHERED. - FUEL LINE MANIFOLD VALVE TO NOZZLE BROKEN DUE TO STICKING EXHAUST VALVE ON CYLINDER NR 6. THE EXHAUST VALVE WAS DISMANTLED FOR CLEANING. A REEMER (PULL THROUGH) WAS PASSED THROUGH THE VALVE GUIDE AND THE VALVE WAS FOUND TO MEET THE MANUFACTURER'S STANDARDS.