Thanks. There is indeed a short in the bridge rectifier (KBU606.) https://dl.dropboxusercontent.com/u/24697861/ProgressSoFar.jpg Ordered the replacement varistor and bridge rectifier for the IO board and already replaced the op amp on the control pod. I've spent $8.40 so far and I have 5 extra op amps and 3 extra varistors. Not bad.