As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT UNDERGOING PRODUCTION FLIGHT TEST. AFTER PERFORMING EVALUATION OF ROTOR FOR VIBRATION, THE PILOT STARTED APPROACH. AS THE PILOT BEGAN TO PULL TORQUE THE ROTOR RPM STARTED TO DROOP. INCIDENT UNDER INVESTIGATION. MORE INFO TO FOLLOW.