Sounds like its the electric window motor.behind the door panel. Not sure about a Jag but it took me long time in my Cutlas just getting at it. Should be fairly reasonable price for the part but the labor will a hefty charge.
Sounds like bad window regulator.
If you get lucky you can spray silicone in the window run channels. That won't fix regulator but it could help a weak motor move it up.
If you broke the side view mirror off and caused this then your channel is bent and needs straightened
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