As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE EXHAUST WAS INSPECTED AFTER FAILURE OF RIGHT ENGINE EXHAUST STACK. EXHAUST STACK WAS FOUND BULGED IN SAME AREA AS FAILURE OF RIGHT STACK (NR 7 CYL). THIS AREA HAD A PRIOR QUALITY REPAIR AND WAS MISSING NUMEROUS HEAT STUDS. STACK WAS SENT OUT FOR REPAIR. 42.4 HRS SINCE ANNUAL.