As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ECU TROUBLESHOOTING, THE RIGHT PROPELLER GOVERNOR WAS FOUND AT FAULT. IT WAS REPLACED WITH A NEWLY OVERHAULED GOVERNOR. DURING THE POST-MX RUNUP, AN OIL LEAK WAS FOUND BETWEEN TO MATING SURFACES ON THE GOVERNOR. IT WAS REPLACED WITH A NEW GOVERNOR.