I found a bulging cap near the power connector on this board. It is above the cap I'm measuring in the picture, you can see the empty spot for it on the board. It is a 470uF/16v made by G-Luxon. It is an LZ (low impedance/high frequency) cap. I removed it and took an esr reading. As you can see in the pic, 2.2 which is about 10 times the .2 or so value you would expect in a typical electrolytic, would be lower in one of this spec. I was not experiencing any problems, but decided to fix it anyway. Desoldering this particular cap was tough because it is on the ground plane which sucks the heat. I would suggest tackling this job with good equipment, not a cheap RS pen type, would most likely damage the board. Replace with a good quality cap, if you go to the Luxon site, they give some recommendations for similar caps of other manufacturers in their substitution table.
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