Unrooting Revolutionary Root?

[Neoatheist]

Does anyone here know how to unroot the Revolutionary root method? I have searched for videos on the subject and when I follow them, my phone doesn't respond in the manner in which it should. Basically, when I get to the part where I am in the hboot screen and it is supposed to recognize that PC136, (or whatever that file was) it fails to detect it and doesn't offer the option to update. Any ideas? Any good references I could use? My phone is acting up and I'd like to unroot it so that I can take it back to Sprint for repair or replacement. Thanks in advance.

PS: Sorry if I sound like a noob. I kind of am, but I would like to learn.