What was found
(CAN) AFTER FIRE BOMBING CARRIED OUT, PILOT WAS ADVISED THAT THE NR 2 ENGINE WAS SMOKING, PRECAUTIONARY SHUTDOWN WAS CARRIED OUT. POST-FLIGHT INSPECTION FOUND THE NR 5 CYLINDER WAS CRACKED AND LEAKING OIL. THE CYLINDER WAS REPLACED AND THE ENGINE TEST FLOWN SERVICEABLE AND THE AIRCRAFT WAS RETURNED TO SERVICE.