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That depends on the amount of drywall that needs to be removed to fix possible damage, if you need to make-4 small holes in one section of the wall I would say it's not a big deal to cut and patch. If you need to do more than that then the amount of work it takes to patch the drywall will exceed replacing an entire sheet, and you'll have increased difficulty getting a smooth even surface.
Personally, I would take down the drywall just to get a look at everything behind the walls and make sure I'm not missing anything that needs to be repaired. Drywall isn't the most fun job in the world, but it's not that bad and the materials wouldn't be to expensive to just re-sheet the bathroom.
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