As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING AN INSPECTION OF THE LT ENGINE FOR ROUGHNESS, A VISUAL INSPECTION WAS CARRIED OUT ON THE RT ENGINE. WHEN THE EXHAUST TAILPIPE WAS INSPECTED IT WAS FOUND TO BE BLOCKED. THE MUFFLER WAS REMOVED FOR THE AFT NR 3 AND NR 4 CYLINDERS ON THE RT ENGINE. THE INTERNAL PIPE WAS FOUND TO BE BROKEN FROM THE END PIECES. ABOUT 4" OF IT WAS LODGED IN THE TAILPIPE. A LARGE AMOUNT OF THE INTERNAL PIPE APPEARS TO BE MISSING FROM THE MUFFLER ALSO.