What was found
BFI-MSO - ABOUT 40 MINUTES INTO FLIGHT, THE LT ENGINE STARTED TO RUN ROUGH, A LOSS OF POWER WAS NOTICED AND PILOT SHUTDOWN AND FEATHERED THE LT ENGINE AND LANDED AT ELM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BFI-MSO - ABOUT 40 MINUTES INTO FLIGHT, THE LT ENGINE STARTED TO RUN ROUGH, A LOSS OF POWER WAS NOTICED AND PILOT SHUTDOWN AND FEATHERED THE LT ENGINE AND LANDED AT ELM.