As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FULL THROTTLE STOP WORN CAUSING A LEAN MIXTURE. WHEN THE PART IS FULL RICH WITH THE SCREW TYPE MIX CONTROL, PRESSURE IS PUT ON THE FULL RICH STOP. STOP IS BEHIND A COVER PLATE WHICH HAMPERS VISABILITY. WEAR CAUSES THE METER HOLE ON MIXTURE TO OVER-CENTER CAUSING A MORE LEAN MIXTURE.