Quoted from nibre:I have replaced the transistors and now the lamps work as they should. I haven't replaced or moved the battery yet.
Thanks for all the advice!
Yeah I'd cut that battery off ASAP.
NVRAM is $15 for a single module from a few sellers.
I sell them @ https://pinside.com/pinball/market/shops/1030-pinitech/00316-5101-nvram-battery-eliminator-for-high-score-save
I'm not usually advertising a ton when people post things like this, but your board is so nice compared to most that I'd really recommend going with someone's NVRAM product and ditching the battery so you can keep it that way. Any time I get a board in that looks like that, doesn't matter if the battery looks like it's been replaced recently.. it's gone! They're ticking time-bombs and anyone's guess when they decide to leak. Even brand new alkaline batteries leak often enough when their expiration dates are 5+ years in the future.