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Tom, it sounds like a resistor if you measure 10 ohm (of the good deocder). Can you circle the component you are talking about and maybe @peteski can help you out? I may be able to too if it's a component with some markings.What about the second bad decoder?
Are there any numbers imprinted on that resistor, (like on most other resistors on that board), or is is just blank?
It is so small that there is nothing visible with my magnifier lamp- just appears to be a small black rectangle. On my monitor, the photo is approximately 5 times the size of the N scale frame and decoder. Maybe with a microscope?