All good advice. I took it apart and there was no beer on the circuit boards at all. It’s the button design that saved it. If you’ve never looked inside one, the “buttons” don’t just contact the actual button on the board. They have a little lip around their edge, no doubt to mount them to the inside of the housing easier. The unplanned advantage is that if you’re quick enough that lip won’t fill with liquid and then pour over into the innards of the controller. I did have to clean the inside of that lip on a couple buttons that were a bit sticky today. All is well so far though. No beer on the boards at all. Like I said…just simple good luck.
As to how the drink got on there in the first place…it was just the physics of bad luck. I took a sip and it decided through some miracle combination of temperature, air pressure, etc. that it wasn’t beer, it was foam…and that the bottle was the last place it wanted to be. I kinda wish someone had been there to see it, it was miraculous.