More than just the resistors and U20, it went under the U20 IC socket, which will be a bit difficult to remove. Also U16 was hit as well as the "B" capacitor. 2018-12-27 12_41_59-Help on assessing battery leakage board damage Bally WPC _ Tech_ Generic _ Pinsi (resized).png

Also you have an area I marked off where the dark areas are actually is the alkaline that got under the solder mask. Best to remove all the parts and then sand on the affected areas, then treating the areas then you can install the new parts. 2018-12-27 12_42_55- (resized).png

As long as there is any of this dull look to any of the parts, it is best to only apply heat to the backside of the board. If you put any heat on the top side of the affected area, the heat will speed up the damage quickly and just eat it up. Once you have the area sanded, it will not be any problem applying heat to the area.

Here you can see a before and after photo of a board I repaired.20170408_115512 (resized).jpg20170409_111916 (resized).jpg

They both will add NVRAM to get rid of those batteries forever.

It definitely would be a bit cheaper having the original board repaired, which I prefer.

Well, you will need a PLCC tool to remove the U9 ASIC chip to move over along with the CPU chip and game ROM.

After you move the parts over, you can resell the old board.