So I got resourceful or inquisitive and tore apart the chassis that was sparking. I could see why easily enough, the wire that comes off the button and goes under the feed chamber had moved and I couldn't get it to go back no matter what I tried. But I wanted a better look at the feed chamber & how these could have a leak from a crack in the plastic. It had the crack, and was easy enough to open up from there.
Once I could see the whole chamber, I'm thinking...how??? I had juice between the chamber and the plastic on dismantling....why? So I fill bottle with water and start feeding. This is what I found....
If you look at yours there is an open space in the feed chamber. A wire goes across from the button and is bent up to what looks like a pin or valve. What gets fire to your atty I imagine. On mine it's that "valve" that leaks when overfeeding. Need to play some more
Hope Brian, John, or Spencer are reading this and it can be a clue for them.