The A2000 is a tank and if a leaky battery ruins it, the leak was really bad as they are mostly the only big box Amiga to survive a leaky battery. Sounds like it needs traces and or sockets replaced. I would suggest you use the board for spare parts (the chips) and just get a nice working undamaged A2000 motherboard. Make sure you always check the NiCad batteries in the Amiga's that have them! As this will continue to happen if it hasn't already....
I recently got a A2000 for free, that was sitting in someones shed. The machine looks unused and was complete in box. It looks brand new. Battery leaked and ruined the motherboard. I tried so hard just as you did to resurrect it but in the end it did not want to work. Bought a replacement Rev 6 board off a forum member for $60 and all is good... Not even worth it unless you are an expect in such repairs!
