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Fixing the text (grammar, spelling, smoothing out awkward sentences, adding explanations if readers have complained that some things are unclear), I think is probably worthwhile if you are unhappy with how it is now.
To do anything more than that, I think, depends on why you want to do it. If you have plans to continue expanding the series then I can understand wanting to bring it all up-to-date with how you are currently writing, so the series feels more consistent from start to finish. But if you don't have plans to expand the series then I would be tempted to leave it alone and spend your time on current or new projects.
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