As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED AN ENGINE FIRE ACCOMPANIED BY BOTH AUDIO AND VISUAL WARNING. FIRE WAS OBSERVED FROM THE COWLING. WHEN THE THROTTLE WAS PULLED BACK THE FIRE WENT OUT AND ALL WARNINGS STOPPED. THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT DIVERTED. SUBSEQUENT INVESTIGATION FOUND THAT THE INTAKE WYE PIPE TO NR 10 CYLINDER HAD SPLIT ALLOWING RAW FUEL/ AIR MIXTURE TO BE BLOWN DIRECTLY ON TO A HOT EXHAUST PIPE. REPLACEMENT OF THE PIPE AND SEALS FIXED THE PROBLEM.