I just got a Cliff Hanger ZPU board in the mail (woohoo!).
Warren pointed out that it still has the battery attached and that the battery is starting to leak. Uh oh!
Time to remove the battery...
Now time to clean up the traces of 'green fuzz' that were near the battery.
I think I got it all cleaned off. I wish I could say the same for Rockford's Star Rider's CPU board. ;)