As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, RIGHT EXHAUST MUFFLER WAS PRESSURIZED AND FOUND CRACKED AT TAIL PIPE OUTLET. A LARGE QUANTITY OF SOOT (EXHAUST GAS RESIDUE) WAS SEEN FLOWING OUT OF THE CRACK AND INTO THE DUCTING TO THE CABIN HEAT SYSTEM. THIS DEFECT HAD BEEN LEAKING FOR SOME TIME AND VERY DIFFICULT TO SEE DUE TO THE LOCATION, THE LT MUFFLER SHOWED SIMILAR DEFECTS.