help with power windows

[butler57]

I hang around on the 67-72 side but I have a couple of questions about my son's 91 burb.
The drivers side power window wants to move about 2" up or down and I suspect there's a lot of corrosion in the track from a leaky window seal and also a potential bad motor.
Does anyone know if the motor/track regulator could be switched with the rear DS door?
Secondly, any instructions on how to test the window motor when we've pulled it? Just want a few ideas before we tear in.

Thanks