Being the Mac user I am, I decided to type a quick blurb on a rather useful site, iFixit. iFixit is a great resource for those that want to download manuals or view instructions on how to repair things. The instructions are very concise and easy to follow, and there are plenty of pics to help along the way.
Keep in mind, I am not suggesting to just go ahead and try to repair something, especially if you have never done this before. However, if the item is no longer under warranty and you want to give it a shot and don't have a GSX (special Apple section) login, this site should be
Click here for more info.