As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXHAUST MUFFLER WAS BROUGHT IN AFTER CRACKS WERE DISCOVERED. CRACK LOCATED AT CONNECTION WITH PART 9954100-7. PART 9954100-7 IS SUSPECT TO BE EITHER SHORT OR LONG. PART 9954100-7 IS REPLACED 4:1. CRACK WILL BE WELDED UP IAW AC43.13 AND PRESSURE TESTED FOR OTHER DEFECTS. REPLACEMENT PDA MUFFLER 9954100-9AWL WAS PROVIDED TO OPERATOR.