Quoted from JT-Pinball:
I could pull the parts and neutralize the alkaline damage but I have no way to test the whole board. I would like to have this done by someone who can test the board so when I get it back I know it’s fixed.
Hmm, that's a toss up then I think. It may be more cost effective and better for long-term reliability to get a new/refurbished board that wasn't hit like your board. Those thin traces that run up from the PIAs (and from the bottom PIA snaked through the top PIA through-holes) often don't survive and wire jumpers have to be stitched in. There's probably 3-5+ hours of work there, plus time testing the board. I know some guys do flat rate quotes, but I'd think at least $200+ to repair it. But even if repaired & tested, it's still not necessarily a guarantee it won't have issues at some point down the road.
There's portable test equipment available for testing these boards that's relatively cheap in the long-run if you'll be doing other repairs over time, but just depends how heavy you want to get into repair yourself. If you'd rather not deal with the repair / testing of the board at all, your options may be outlay of $200-250+ to have it repaired by someone or to buy a new board or refurbished board in better shape. Upside is, if you don't mind dealing with shipping a board, someone would probably pay something for your current board to offset some of those costs.