@trebroNdotnet Two traces on the bottom left are indeed open, but they're just the raw audio L/R signals going to the video slot. I won't bother reconstructing them for now.
The ICs above the battery belong to the Amber subsystem, which works for me. I don't believe they're causing the vertical lines every 16 pixels. Those must be a short of some kind on the Denise data bus.
The Denise socket has some corrosion and should be replaced, but I'm waiting to get a better desoldering gun for that.