As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE ENROUTE TO A FIRE THE FLIGHT CREW HAERD A LOUD BANG FROM NR 4 ENGINE. THE CREW SHUT DOWN THE ENGINE AND FEATHERED THE PROP. THE AIRCRAFT RETURNED TO YZH. MAINTENANCE CREW DISCOVERED A CRACKED EAR ON THE NR 13 CYLINDER. THE CYLINDER WAS REPPLACED WITH A SERVICEABLE ASSY AND THE AIRCRAFT WAS RETURNED TO SERVICE.