It's pretty simple to open up, just 6 screws. 1 in each corner on the back, plus 2 on the bottom edge (tiiiiny little silver ones that hold the mounting bracket)
Once you are inside, it's 2 screws to hold the controller board on (along the bottom edge) and then the screen/touchscreen overlay is held down by 4 screws, 2 on either side, which have little metal "clips" that go over the edge of the screen.
The buttons can then come out, they just pull out from the back, or push them from the front.
Re-installation is opposite of pulling it apart

Just make sure you line up the touchscreen overlay and actual lcd panel in the centre of the gap
Garry