As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CUSTOMER SUBMITTED GOVERNOR FOR INSPECTION DUE TO HIGH CARBON CONTENT IN OIL ANALYSIS. INSPECTION REVEALED THE SYNCHRONIZING COIL HAD COME LOOSE IN THE COVER. THE COIL CONTACTED THE FLYWEIGHTS WHICH CAUSED MATERIAL TO BE REMOVED FROM THE COIL.