As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSTALLED O/H FUEL SERVO AND RAN IT TO SET THE IDLE MIXTURE SETTING. ACFT SAT OVER THE WEEKEND AND WENT TO COWL THE ENGINE AND NOTICED A SET SCREW AT THE FRONT OF THE SERVO WAS LEAKING FUEL. SCREW IS NOT USED TO ADJUST IDLE MIXTURE AND WAS LOCK WIRED AT THE O/H FACILITY.