I'm not a solder-er, so I'm not familiar with the tool. But I might know someone who is.. I missed in your first post you were recommending for me to try to pick it off. That I can try! My first assumption was that it was eroded away. But I don't remember what it looked like when new, so picking is definitely an option at this point.
I'll be sure to update when I know something. Great project for tomorrow.
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