The speaker selector slide switch on my Bogen DB114 has crapped out. I don't want to replace it with a new slide switch (unless I can find one with a white plastic slider). So my plan is to get to the switch and jump the terminals so it feeds the A speaker only. Should be simple...once I figure out how to open up access to the back side of the switch. I removed the three small philips along the top backside of the panel. Nothing moves. What's the procedure for getting access to the back of the front panel?