As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN REMOVING NR 1 CYLINDER TO BE CHANGED OUT THE LIFTERS WERE REMOVED TO BE BLEED DOWN, LIFTERS WERE SPAWLED. THE AME INSPECTED THE CAM AND THE EXHAUST LOBE WAS ALSO SPALLED. THE ENGINE WAS REMOVED AND PREPARED FOR SHIPMENT TO A REPAIR SHOP. UNDER FURTHER INVESTIGATION WE FOUND OTHER LOBES AND LIFTERS WITH SPALLING. OUR HYPOTHESIS IS LACK OF ENGINE USE CAUSING INTERNAL CORROSION/RUST WICH LEAD TO FAILURE (TC NRIN 20070522003)