Glad you figured it out. Obviously your unit is more sophisticated than the ones I have worked on.
Everyone has their own methods for winterizing, but when you winterize next time, you may want to consider using compressed air to blow out the lines. This avoids the use of RV anti-freeze, except a small amount for each P trap. RV anti-freeze gets really stinky during storage.
When I winterize my MH, I remove the water heater drain plug (which is also the anode) and drain the tank, then replace the drain. I then hook my compressor to the "city water" inlet and blow everything out....thoroughly! I leave all the drains open and put the RV antifreeze in the drain traps. For mine it takes 1 gallon to do all of them. While I have a water heater bypass, I never move it. My method removes all water, and I've never had a failure or leak...and I live in Montana where is gets to minus 30. The only downside to this method is that it requires an air compressor regulated to 30 PSI.
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