As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE COMPLETING 100-HOUR FACTORY INSPECTION, NOTED CORROSION BUILD-UP AFT OF EXHAUST ON TOP OF RT NACELLE. REMOVED CORROSION AND FOUND 1 INCH HOLE. BOTH SKIN AND FRAME HAD BEEN EATEN THROUGH. REPLACED FRAME WITH NEW AND C/W RIVETED PATCH REPAIR ON NACELLE SKIN. SUGGEST PEROXIDE CLEANING INSPECTION AND PAINTING OF THIS AREA.