OK, it looks like I've had my first failure. The + button that controls the lighting on my Envoy Aux panel died recently--all the other buttons work. My kids make a game out of changing the colors when they are in the spa. They've probably gone through ten years of button pushing in six months. Maybe the factory has some openings for them on the weekends. They can push buttons faster than any machine out there.
Anyway, when I get this fixed I guess I'll have to make the light changing routine a special activity. Is this a common failure? I actually have the new style aux panel with the hard black buttons.