The problem was with the two piece plugs seizing if they weren't changed, and they would snap off in the block. This would require some serious labor added. There is a TSB on these and the dealers follow the procedure to loosen them and get them out without breaking them.
If the truck has had the plugs changed in 205k then the problem is null, it's the factory plugs that had the problem. You can change them yourself if you're certain they've been done previously.
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