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Well when you get the camera up and running take a "as high a resolution" as you can picture of the whole underside. Maybe a couple more eyes can help come up with something! I would hold off on Ebay as it sounds like you could use this tester, and would enjoy it! What you describe sounds like there is something "open" in the in the circuit in the non test mode. But hey at this point I am drawing at straws. You may be on the right track with the test switch. Since this was a commercial unit that saw a lot of service the contacts may have just been worn out! May have a bit of an issue finding a replacement if you need one but that is another story. Later.
Terry
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