I am not sure these are CIA problems. They could be, but these are not usual. The most usual is your mouse and/or joystick not working.
IIRC aren't the A3000 chips surface mount? The 2500 are easy to get at.
Have you tried running SnoopDOS? That can tell you exactly where the problem is. Very handy program!
Also, do make sure you get those batteries out of those machines, if there is ANY sign of leakage! Specially the A3000. A bad battery can easily kill the Mobo in an A3000.
