As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, ENGINE WENT TO MAX POWER AND WAS UNCONTROLLABLE. ENGINE WOULD NOT RESPOND TO POWER LEVER OR EMERGENCY POWER LEVER. ENGINE WAS CONTINUOUSLY OVER TORQUE AND OVER TEMP LIMITS FOR 7 MINUTES. AIRCRAFT WAS FLOWN TO NEAREST AIRPORT BY CYCLING THE PROP IN AND OUT OF FEATHER. ALL ENGINE RIGGING WAS FOUND TO BE INTACT. SUBMITTER SUSPECTED FUEL CONTROL DRIVE SHAFT FAILURE. THIS EVENT IS STILL UNDER INVESTIGATION. (X)