One funny thing to note is that when I went to the Apple store recently and asked the Genius about his opinion on Jailbreaking, he said 'uhhhh, what dude? I don't know what that is, or what it does (smirk.)'
To the OP, no, it doesn't void warranty. However, if you bring in for a repair, say battery, motherboard, or any other internal parts, they could blame you on opening your computer in a very humid room where moisture could have got in and caused the trouble. If I were you, I would just put it back JUST IN CASE so that I won't have to face additional troubles.