The engine is being removed and a "drop-in" replacement will be ordered. When the engine is out of the truck (after my travel activities of the next two weeks), I plan to remove the pan only to check the condition of the bottom end and the pistons. This will be only to answer my curiousity about the engine's condition and source of its problems. Then, the old engine will be reassembled so that it can be returned for core credit upon receipt of the replacement. During the installation of the replacement engine, the plan is to add a remote FSD location, a new engine oil cooler assembly, including hoses, and a new exhaust system. (It is expected that the "kitty" will run away from the shop in the process!)