I think it is either #1 or #2. I am trying out #1 first.

72-240 is what I tried just a few moments ago. The key would not budge enough to take the key tumbler out.

will have to read up on 72-250 before I tackle it... better get a beer or two out... looks like my window regulator job's grease will end up all over me.

The system was absolutely normal a week ago... the car sat while I was working on the door panel since it was removed and now this crazyness.

Anyone chime in on a vacuum check value? I disonnected the hose coming out of the locking mech (no noise), and nothing changed.. Is there a different location I should be looking for this check valve?