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One possiblity is on a 91 there is a switch mounted inside the door on the bottom, which are closed when the windows are all the way down, it's possibly an adjustment of the striker for one of these switches(there is one in each door).
Try rolling up the windows using the console switches, then try to lower the top. If the windows both lower, then everything stops working (and the top switch starts to blink) then I believe that one of these switches is the problem.
Gilly
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