As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACED THE PROP CONTROL SEVERAL TIMES DUE TO RATCHETY OPERATION. THE VERNIER MECHANISM DOES NOT SEEM TO RELEASE COMPLETELY MAKING IT HARD TO ADJUST PROP RPM SMOOTHLY. WE HAVE BEEN THROUGH 3 PROP CONTROLS IN RECENT MONTHS DUE TO THIS FAULT.