As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON COMPLETION OF FIRE BOMBING RUN, SMOKE WAS NOTICED TRAILING FROM NR 2 ENGINE. PRECAUTIONARY SHUTDOWN WAS CARRIED OUT. POST-FLIGHT INSPECTION FOUND THE NR 3 CYLINDER HAD FAILED. THE CYLINDER WAS REPLACED. THE ENGINE GROUND RUN SERVICEABLE AND THE AIRCRAFT RETURNED TO SERVICE.