As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RT MUFFLER END PLATE CRACKED BEHIND RT FORWARD EXHAUST INLET (NR 1 CYLINDER). NOT LEAKING INTO HEAT MUFFLER. BARREL ALSO BULGED FORWARD SIDE NEAR OUTLET (USUAL PLACE). BOTH DAMAGES MAY HAVE BEEN CAUSED BY AFTER FIRING IN MUFFLER. MUFFLER HAS BEEN PREVIOUSLY REPAIRED ON OPPOSITE ENDPLATE. CRACK PROBABLY DUE TO METAL FATIGUE AND AGE.