I got the buttons from the manufacturer (great guys at GTR Labs), and opened up the control panel. This is what it looks like inside.
There's just a little circuit board with nine screws holding it.
|You can see here the expose button, the blue button, reflected in the mirror, and on this side, the four prongs of that button poking through the circuit board. These are soldered on. It's not like your atlas, which can get bumped out of position.|
|You may need to set the soldering iron on all four prongs, getting them hot enough so the little bit of solder still in the hole melts enough to wiggle the entire button loose. Then it takes about 30 seconds to solder the new button on.|