Power button not working

My Macbook Air underwent some liquid spill and wouldn't turn on at all.

I replaced the logic board, and managed to jump start the computer with a flat head screwdriver since the power button wasn't working.

Now the computer seems to be working fine (although a little slow), and the whole keyboard seems to work except for the power button.

Is there any way to fix the power button (or whatever is causing the issue) without replacing the whole top case?

Thanks a lot!

-Mat