Hey DB:
I am sorry to hear about your reverb woes. Just an FYI. My reverb problem was rather elusive, and I ended up taking it to two different techs, who both had trouble locating the problem. To make a long story short, both techs initially thought that I had just a loose connection. After readjusting the wires, they both thought they had the problem fixed. The third time I brought it back, I was pissed to say the least. I hadn't even had the Roadster for 13 months. Anyways, after prodding and poking the tech realized that there was a little soldering issue in the tank itself. The issue was very difficult to detect and the tech said that it was probably just soldered improperly. At any rate, a new tank was ordered and everything is fine and dandy now. In hindsight I don't blame Mesa, since they didn't make the tank (Accutronics makes the tanks), and because the issue was able to fool Mesa quality assurance team and two separate techs. Go figure!
Just thought you should know. Maybe your tank is suffering from the same issues!