As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRODUCTION FLIGHT TESTING, THE LEFT ENGINE WAS SHUT DOWN SEVERAL TIMES IN-FLIGHT. ON THE 6TH TIME, THE PROPELLER WOULD NOT UNFEATHER ALLOWING AN ENGINE RESTART. PILOT HAD TO MAKE SINGLE ENGINE LANDING. UNFEATHER PUMP WAS REPLACED AND SYSTEM OPERATED NORMALLY. PUMP IS BEING RETURNED TO WELSON.