I would have looked at the wiring where the door hinges. That wire is continually flexed everytime the driver's door is opened and can slowly break down resulting in a loss of current. Pull the switch (if it's on the door) and see if it's got power.
While you've got it all apart you should lubricate the entire window mechanism inluding spraying some silicone spray in the window channels.
While you've got it all apart you should lubricate the entire window mechanism inluding spraying some silicone spray in the window channels.