As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON UNCOWLING THE RIGHT ENGINE FOR AN OIL CHANGE, A HOLE WAS FOUND IN THE EXHAUST PIPE OF THE TURBOCHARGER. A NEW PIPE WAS INSTALLED. THE HOLE WAS APPROXIMATELY 2 INCHES BY 2 INCHES WITH A 4 INCH CRACK OUT FROM THE EDGE OF THE HOLE. NO OTHER DAMAGE WAS FOUND.