30" Cinema display power button not working.

30” Apple Cinema display works fine, powers on when plugged into power and computer. But the power button on the side at the bottom doesn’t do anything.

I’ve removed that side panel and there is a small circuit board for the power button and other buttons at the bottom. Where can I get this circuit board, or, preferably, the whole side panel (LOTS easier to replace)?

And are the side panels of other Cinema Display sizes the same circuit board (side panel would obviously be smaller)?

Thanks.