I have a rear window that occasionally will not go up. This has happened three times now, and I'm worried that it might fail at a bad time. I am suspicious of the master switch in the driver's door. When it fails it will still go down from the driver's door and from the rear door switch. It just will not go up. Today, after repeated attempts from both switches I twisted the top of the master switch and it started working. I would like to verify the master switch as a likely culprit before I replace it. If it stops working completely I can check it with a meter, but right now it's working!
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