Just the screws. I took mine out and put it back in a couple years ago. My boat is stored a long from here so I can't look at it to give you more details.
The whole interior can be removed fairly easily. You just have to pay attention to the order you need to take things apart, and make sure you get all the screws.
When you reassemble you might want to put a little silicone on the screws to seal them for water when they go back in. (not much)