I have "door open m" and "bill Validator com" errors. There was a tiny bit of leakage from the Varta Battery so I removed it and replaced with new. Cleaned the acid spill (again tiny amount), and checked all traces in the area, and all seem good. I am happy to just buy a referbed MPU board, but wondering what I would need to do to swap the game over to the new board. I assume I just need to swap the 3 removable "chips" over? Do I have to reprogram other stuff? Do I need is Chip Key of some kind to do that? If so how do I obtain said key? Sorry for all the questions, just new to this. I have done alot of pinball repair, but this is my first slot machine. I am not SUPER strong at component level troubleshooting, but I have enough skill to do minor stuff.... thanks in advance