It's fixed....
No, it wasn't any of the micro switches, which surprised me. The way to determined that is to listen to the door from the outside when the handle is lifted. If the door handle micro switch is working, the window tries to lower and you can hear the motor. If you can hear the motor, the next step is to carefully press down on the top edge of the window. If the window lowers the correct 10mm, the issue is cable related. This was the case with my passenger's door.
As we disassembled the door for the repair, it was evident we were the first to take the panel off. There was no sign of a previous repair or any accident damage. I'm only guessing but I suspect that at some point in the car's life a dent repair effort may have happened and this cable was accidentally kinked. And it eventually got to the point it wouldn't fully operate correctly. Just a guess.
