As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ADVANCING #1 ENGINE FROM IDLE TO FLIGHT POSITION, #1 ENGINE BEGAN TO "RUN AWAY" AND THE AIRCRAFT SPUN APPROXIMATELY 25-30 DEGREES ON THE PAD AND STARTED TO ROLL OVER. THE PIC WAS STILL ON THE ENGINE MODE KNOB, IMMEDIATELY RETARDED TO #1 ENGINE BACK TO IDLE STOPPING THE LEFT YAW, AND ARRESTED THE ROLL AND THE AIRCRAFT RETURN TO FLAT "AIRFRAME LEVEL