As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS RUN PRIOR TO SCHEDULED MX CHECK AND SEVERE ROUGHNESS WAS NOTED WITHFUEL LEAKING FROM COWLING. INSPECTION REVEALED FUEL WAS FLOWING FROM CARBURETOR JET. FAILED CARB HAD BEEN INSTALLED THE DAY BEFORE. FAILURE IS CONSISTENT WITH SUNKEN OR STICKING FLOAT. O36A4M