As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 100-HOUR INSPECTION, DISCOVERED LARGE MUDDAUBERS' NESTS IN THE INLET TO THE FUEL INJECTION PUMP. THIS WEBCO KIT WAS INSTALLED IN RESPONSE TO AN AD NOTE FOR AN ALTERNATE ENGINE INLET AIR SOURCE. (CARBURETOR HEAT BOX TYPE DEVICE). THIS AREA IS AFTER THE AIR INTAKE FILTER AND CANNOT BE DISCOVERED ON PRE-FLIGHT.