My fix for most Solid State games is limited to changing fuses, or reseating connectors or chips or swapping boards.
On rare occasion might need to get out the soldering iron.
Course changing flipper coils and other solenoids is basically the same on either S/S or E/M pins.
My confidence is much higher with being able to get an E/M up in running eventually, though in fact it may take longer to go thru all the components to make them work proper, especially multi-player score reels and stepper units etc., but in the end more satisfying.