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A couple of things, you probably should have left the original page and created a page for the refit.
That being said since this is an update the Nomenclature should reflect that with it either being a 1b or a 2a
You need to update the history to reflect that in YE 37 the class of ship underwent the specified upgrades. You should also probably leave the original systems listed but state that they have been replaced with xxxx.