So as the debate continues on whether a power outage caused my fridge to fail, I received my new to me motherboard on Monday and installed that evening. When I removed the old motherboard, there was one solder point on the back side of it that was black and clearly looked charred. I should have taken a picture but alas, I didn't. Anyway, fast forward to this morning and the fridge has retained the proper temperatures all week. We are away this weekend, but, I fully expect to have my garage beer fridge back on Sunday! Will just have to make a trip to the beer store to fill it again! :) 

So, as it stands I spent $50 for a guy to come look at it and I spent $73 on the used motherboard from Ebay. I'm guessing bringing in an appliance repair guy to do the job would have cost me $500, maybe $450. A new fridge was going to be around $1800. So, my $123 gamble SEEMS to have paid off. If nothing else, it might buy me a couple of months. If/when it breaks down again, I will most likely bite the bullet and buy a new one like most on here recommended.