Be weary of sending it in for service. If you have data on the drive that is critical or important, you should create backups or physically remove the drive.
Also if you have secret or information that you do not wish other people to see, you may need to take the drive out for that reason as well.
Obviously when you ship the laptop anywhere, there's a chance for it to get stolen along the route one way or the other, or more physical damage or loss or potential mishandling of the package (drops, crushed, etc).
The chances of some of these instances happening may be slim, but the one time you let it out of your site, then that's when the mishap could happen.
You could certainly do as some of the others posted, sending it in, taking it to a local service center, or replacing the dented piece. Youtube could have a plethora of info on how to dismantle it. Just reverse the steps back to putting it back together.