As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED THAT THE LT ENGINE WAS RUNNING ROUGH. DURING INVESTIGATION BY MAINTENANCE CREW IT WAS DISCOVERED THAT BOTH NR 2 AND NR 8 CYLINDER HEADS WERE SEPERATING FROM THE BARREL. ONE CYLINDER HAD A SLIGHT OIL LEAK EVIDENT AND THE OTHER AN AIR COULD BE FELT IN THE AREA OF SEPERATION. THE CYLINDERS WERE REPLACED WITH SERVICEABLE ASSEMBLIES AND THE AIRCRAFT WAS RETURNED TO SERVICE.