Initially thought this might be a shorted switch, but as you can see in the video--the switches in switch test all appear to be fine.
I haven't pulled the sound rom and re-seated. The batteries are still on the board (soon to be remedied) but everything in that area appears super clean.
Something must be triggering the sound sample... I think "It's showtime" is triggered when a game is started, so maybe it has something to do with the start button.
Thoughts?