As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE MAINTENANCE, PROP BALANCING, THE AME NOTICED THAT THE UPPER EXHAUST TAIL PIPE ON THE RT ENGINE HAD A LARGE HOLE BURNED THRU. PIPE WAS REMOVED AND FOUND TO HAVE ERRODED FROM THE INSIDE AND HAD SEVERAL CRACKS. UPPER AND LOWER TAIL PIPE, PN 40310-008 AND 40310-009 WERE REPLACED WITH O/H ONES ON THE LT AND RT ENGINE.