As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED MUFFLER INSPECTION PER AD 98-13-10. NO CRACKS FOUND. PERFORMED PRESSURE TEST PER CESSNA SB 98-78-02 AND FOUND 1 INCH CRACK ALONG EDGE OF WELD ATTACHING FLANGE TO FORWARD END PLATES. CRACK CANNOT BE VISUALLY SEEN UNLESS MUFFLER IS REMOVED AND HELD IN BRIGHT LIGHT. AD DOESN'T REQUIRE PRESSURE TEST, BUT SB DOES. AD HAD BEEN C/W 14.7 HRS PREVIOUSLY AND NO DEFECTS WERE NOTED.