I agree, take those batteries out of the oven-- I mean, battery holder, they look like they are cooked well done.

If the playfield is completely cleanable, that can be salvaged. There may be some life left in the boards if it powers up and stuff happens, but the DMD is quite possibly toast and may need replacement. Check the connectors for continuity (actually, for visible damage as well). Once the connectors are known to be good, any remaining issues have to lie within the boards.

This is a fun game, I played one on location at a bar before it was replaced with Yet Another Punching Bag Machine some months later. I'd hate to see it parted out, but can't yet rule out that possibility.

Cute kitty! And smart too, the top of a turned-off Donkey Kong cabinet is a pretty good place to nap...