Quoted from shacklersrevenge:
I disagree with all the above. Great game to learn repair on, a wealth of information is available for this era, as well as parts, and it’s a ton of fun to play.
I can’t count how many times I’ve picked up a “dead” Bally like that one and given it a slap and a kick and it boots right up. They’re not real hard to fix, once you know what you’re doing.
I agree, from the images it cosmetically looks great. and it's a terrific game.
Ask for a pic of the boards & post them here. if badly corroded battery on MPU your probably looking at least $200 for an ultimate MPU + re-pinning a good few trifuricons https://www.allteksystems.com/alltek-products-ultimate-mpu-board.html
If just starting to corrode maybe $20.oo for a NVRAM board https://www.pinitech.com/products/5101_nvram.php