metro unroot for return?

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http://androidforums.com – since my 4g isnt working and i already have burn ins, i say **** metro. so i'll return the phone for another one that hopefully won't feel refurbished, and it's been 5 days so it's all good, they said i can return it in a period of 7 days. will they look if its rooted? (i can uninstall superuser for some reason, if that's all they look at) i already installed most of the apps that came with the phone, except metroweb... i tried and i couldnt lol, i did the system/app thing but no luck. if so, how the hell do i unroot my galaxy? ive looked around the web including youtube and they're all f (General)