ballast switch problem?

I have an 02 X-star. Yesterday my starboard ballast would not work. The light on the switch would not come on whether you turned it to fill or drain. The other two work fine. I see there are little breaker buttons below the switches. The one for this switch is missing though? There is just a hole where it's suppose to be. The switch/pump had been working fine for the past 6-8 trips out in the boat? Is there any fuses anywhere to check? Where do I start? The fact that the little breaker is missing makes me wonder if the previous owner had problems with this switch too? Thanks.

trying to trouble shoot this problem yet. Found the breaker switch, it was pushed in and behind the drivers side panel. It wasn't tripped either. I flipped the switch in my garage and now it's working? What's up? Bad switch? Short somewhere? I tried removing the driver side panel but can't figure out how to get it off. There are three big star headed screws that have nuts on the back of them. Trying to remove it, the nuts spin. Can only reach one of them. Can't get to the back of the two others to get a wrench on the nuts to prevent them from spinning. Any help here?