You may want to post over at rec.games.video.arcade.collecting also. I post a couple years ago and got multiple responses. And just so you know, if you can get a working Red Baron AUX board you can use a Battlezone main board with a Braze Red Baron ROM Saver Kit(future High Score Kit) and it'll work.
I know ArcadeShop.com sells the kit but I'm not sure if you could get it from Scott also. I know he said it's just a ROM swap with the Battlezone Kit but he doesn't list it on his site.