I replaced the tantalums myself (see top of post) as I had them left over from an SE 30 recap, but I didn't have any 100 microfarad caps. I was hoping that the problem resided in one of the 47 microfarad caps. I also manage to consistently pick the slowest line at the supermarket, so I guess I shouldn't be too surprised about the outcome. Here's hoping that the problem is indeed in these last two electrolytic caps and not the ethernet board.