Thanks, I'll pull it out and remove the bottom cover (I assume there are no tricks to getting that cover off?). Never thought of looking at that while it was out and I was swapping drives.

I can't imagine how any water would get into there considering how dry it is here year round (about 9" of rain per year average) and that the car stays in the garage when it's raining. Humidity is typically very low here too, so it doesn't seem like condensation should be a problem. But as I had said - it does seem like an electrical connection issue, so maybe something has corroded a connection or 2 somewhere.