I had a Dexter with the RESET and DIAGNOSE lines tied together somewhere. I suspected a solder bridge but I couldn't find it. So I decided to send some current through RESET and DIAGNOSE and get out my thermal camera to see where things were getting hot. Here's what I saw:
I eventually found the bridge, but was not in the most intense place on the PCB:
In the future, instead of looking for the most intense spot on the PCB, I should observe the path that the heat is traveling. The fact that the heat was traveling down and left of where I was applying power was a clue that I would find the bridge somewhere along that path.
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