As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE RUN UP TO ANALYZE A FUEL FLOW PROBLEM, IT WAS DISCOVERED THAT THE RIGHT MAGNETO WAS DEAD. SUBSEQUENT INVESTIGATION REVEALED THAT THE RIGHT MAGNETO WAS INTERNALLY LOCKED AND FOUND THAT THE MAGNETO DRIVE GEAR AND THE ACCESSORY DRIVE GEAR WAS UNSERVICEABLE. MAGNETO BEING SENT TO MFG FOR EVALUATION.