As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF ENGINE LOST POWER, AND A LARGE THROTTLE STAGGER WAS NOTICED, ALONG WITH A SIGNIFICANT DIFFERENCE IN FUEL FLOW. PILOT SHUT OFF AUTOFATHER SYSTEM AND NOTICED THAT THE BLUE BETA SYSTEM LIGHT WAS ON WITH A LARGE INCREASE IN ENGINE TORQUE AND LOWER PROP SPEED. INSPECTION FOUND THAT THE BETA MICRO SWITCH HAD FAILED CLOSED.