What was found
UPON PERFORMING OTHER MAINTENANCE, A CRACK WAS DISCOVERED IN THE EXHAUST STACK/RISER ASSY UNDER THE CLAMP POSITIONED APPROXIMATELY 12 INCHES FROM END OF EXHAUST. SUBMITTER SUSPECTS HEAT, VIBRATION, AND FATIGUE CAUSED ROLE IN PART FAILURE. SUGGEST AREA BE INSPECTED CAREFULLY TO PREVENT RECURRENCE. AIRCRAFT HOUR METER 5,964.0.