As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STACK CRACKED AT FLANGE APPROXIMATELY 6 INCHES IN LENGTH. DEFECT FOUND ON PRE-FLIGHT INSPECTION. SUBMITTER SUGGESTS ENGINE EXHAUST STACKS BE LOOKED AT CLOSELY ON POST-FLIGHT INSPECTIONS. NEW EXHAUST STACKS P/N 101-950022-1 SEEM TO HOLD UP BETTER BECAUSE OF REINFORCEMENTS INSTALLED DURING MANUFACTURE.