As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, THE PILOT NOTED THE NR 1 ENGINE WAS RUNNING ROUGH. THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT RETURNED TO BASE. POST-FLIGHT INSPECTION REVEALED A HOLE IN THE ENGINE CASE, IT WAS ALSO NOTED THAT A CONNECTING ROD HAD FAILED. THE ENGINE WAS REPLACED.