I'm a big DIY too. I got a big HD flat screen for $300 on Craigslist. I had done a Google search based on the model number and serial number, and they all seem to blow the power supply caps. Two new caps at $3 each, a few moments with the soldering iron, and it has served us for a couple of years now. I went to buy another one just like it, but people have snapped them up, repaired them and are asking more money. Bummer.
But as to your board, if all else fails, you could send it to Horizon Spa Parts. They have a web site which is very helpful, and they are good folks. I know you would like to do this for less, but it might be easier in the long run to have them fix it for you, and I don't think their prices are outrageous at all.
Just a thought -
HTH