Oh, forgot your problem. Those original WE 400D KTU cards were almost made to mil spec. They weren't fiberglass PC boards as we know them and probably could be submerged and still work. I have never seen anything that would leak or even any exposed copper that could corrode, though I have seen the gold plated edge connector pins turn green. Has to be from something external but I would be interested in seeing a picture.
-Hal
