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I thought I would touch on this subject as this knowledge may come in handy if SHTF and we had to repair or even make new items from old materials. I personally have no electronic experience but I am glad I stumbled upon this info as I could use this knowledge right now.
Over at mods-n-hacks.wonderhowto.com they show us how to repair faded or corroded traces on circuit boards with a led pencil. It is really ingenious. See the full article below: