As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH 26 HOURS ON O/H CARBURETOR SUPPLIED BY MFG WE WERE NO LONGER ABLE TO PROPERLY LEAN AT AN RPM. INSPECTED AND FOUND LEAK AT TOP AND BOTTOM OF ACCELERATOR PUMP. TRIED TO ADJUST MIXTURE AND FOUND NO CHANGE IN LEANING. REMOVED AND RETURNED TO REPAIR STATION , I/A/W MFG INSTUCTIONS TO BE O/H AGAIN.