I have an Overhead Door Python Chain Glide, Model OCG750 garage door opener that was installed in 1995. The wall button is working only intermittently. (The remotes work fine.) My problem is that I can't figure out how to open the wall button console or remove the console so that I can test it or replace it. There are no visible screws, no obvious place where the front face plate/cover snaps on or off, nor a place to use a flathead screwdriver to pry it off. In fact, I'm not even sure if the front cover does snap on/off because I don't know how the console was originally mounted to the wall. I'm guessing there are two screws through the back plate into the wall and the faceplate snapping onto the front, but I don't want to break it if I'm wrong. Has anyone ever encountered one of these Oldie Goldies? See photos below.

Thank you so much. Any help is greatly appreciated!
Carol