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That's really interesting, thanks for checking that out. As I was saying they were not wired on the old unit I had, but it may be that they started wiring them on the newer units (I suspect from the 5-ton). Since I have a NOS unit, it will be worthwhile for me to hook up an interface and see if...

a,N,D,A are the diagnostic busses. If you PM me your email I can send you the technical material.

So you know while you are in there poking around, I tore the dead one I had open to see if the diagnostic pins on the amphenol were wired. They weren't in my example, which is too bad because the software to program / diagnose them seemed to be obtainable from eaton. Are they wired on yours? I...

upside down on a cookie rack, bake in oven, let it drip out?

I was going to tell you to look on the microscope next to the oscope...

I've heard from other members on SS that they opened theirs and there was no potting. The one I opened was on the truck when I got it but I cannot be certain it was original to 1992. I ultimately replaced it with NOS, and I have not opened that one.

This was when I took mine apart...

Acetone maybe? I read that's effective against some kinds of potting.

I don't laugh at potting, I tried to get it out of a CTIS module (and eventually did after making a huge mess). On the module I had, it was a sort of hard jelly if that makes sense, like a silicone, and it was a deep red / purple color. When you cut or chipped at it, it came away in crumbles...