Got the pump armature/shaft back from the machine shop today. I think it's going to seal just fine now. The passenger side rear door did have a cylinder which I managed to drop on the floor revealing a homemade connecting rod and a broken piston that had split along the clip retaining groove. I disassembled one of the extra cylinders and it had a black plastic piston. The plastic piston was a big surprise as I had no idea anybody made them. This whole system is a hodgepodge of unmatched parts and make-do, amateur fixes. I'm hoping I have better luck with the solenoid switches but I'm not holding my breath.
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