As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON INSPECTING AIRCRAFT FOR PART 135 OPERATION, THE LEFT PROP GOV WAS FOUND TO BE A PART NUMBER NOT AUTHORIZED FOR B-100'S. THIS WAS CONFIRMED THROUGH WOODWARD GOVERNOR. THERE WERE NO OPERATING PROBLEMS AT THE TIME. GOVERNOR WAS REPLACED WITH PROPER PART NUMBER OF 210939. THE GOVERNOR WAS BEING REPLACED ALSO DUE TO 6-YEAR OVERHAUL REQUIREMENT PER WOODWARD SB 33580E.