Yep, its looking more like a defective 3-in-1 board.

I'm calling Tower Tech Support tomorrow am for a debugging session.

Meanwhile, at home I can analyze the problem more closely.

Since the main problem has boiled down to "no response from Gyro Gain Pot adjustments",

I can power up the system and see what my DMM says around that pot. If nothing changes, it could be a bad pot. I have a parts place nearby that probably has that pot in stock, and could replace it myself, in theory. For now I'll collect the data and see what Tower says.

I hope they don't give me flak about replacing the thing or I'll P.O.'d!! [:@]