As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE INSIDE OF THE OIL FILLER TUBE AND OIL CAP WERE RUSTED TO THE POINT OF FLAKES OF RUST BEING KNOCKED OFF OF THE SURFACE AND FALLING INTO THE CRANKCASE. SUBMITTER STATED THESE ASSEMBLIES SHOULD PROBABLY BE MADE OF STAINLESS STEEL. THEY ARE CADMIUM PLATED WHEN NEW, AND THAT DOESN'T SEEM TO PREVENT THE CORROSION.