hifi engine

Denon RC-8000 remote control

Has anybody had experience with Denon's RC-8000 remote control? The touch screen won't calibrate at the upper two targets so I'm guessing the screen is bad. I'm trying to open it to get a part number off of the screen to no avail. There are four screws on the back that I've removed but it seems to be held closed beneath the rubber grips on the side of the unit. If anyone knows how to get into this thing or where to view a service manual please advise. I inquired on remotes.com website about a replacement and they said there is no replacement. My reciever is the AVR-4802.