I removed the door panel and found the vertical cable had slack. I removed the motor/regulator, applied 12v and it mysteriously worked perfectly and the cable was tight. I reinstalled it and realized the cable bracket had rotated down which prevented the window from raising that distance. I'm not sure how it was able to slip (I'll recheck tomorrow) but after rotating the bracket up, the window was able to raise all the way up to the frame.

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