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Triumph has the right to try and repair a problem rather than replace (warranty).  The trick is to keep you happy/satisfied with the repair experience.  The best way is to replace the bike but.....  so a loaner bike similar to the one you own, while yours is out for repair,  should be provided.  I'm not sure what part of the engine casing needs to be treated but if it's done properly, it should be permanent and unnoticeable.