As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED INSPECTION, THE PRIMARY EXHAUST DUCT WAS FOUND TO HAVE A 2.5 BY 6.O INCH HOLE IN THE CENTER OF THE OUTBOARD SURFACE OF THE DUCT. THIS AREA IS LOCATED BEHIND THE OIL COOLER AND IS NOT VISIBLE WITH THE COWLING INSTALLED NO DAMAGE TO THE SURROUNDING COWLING WAS FOUND.