Late reply but here's what I found on a 2003 Camry. Passenger side window wouldn't go down. Removed the door panel and found the motor plug unplugged. After testing power circuit, purchased a new master switch from a salvage yard for $105.00. Easily removed the old switch to add the new switch. Removed the passenger side switch w/o removing the door panel and plugged the power connection into the motor. Fixed. I like to find out what causes problems. I separated the old switch and found there is a fork on the end of the switch levers. These things are cheap, thin plastic. One of the fork fingers had broken off. All the fork does is move the lever of the switch mounted on the circuit board. Electrically the switch was good.
I've used non-Toyota switches before w/o any problem.

 

Thanks for posting back with then in-depth and interesting repair. Sure it will help others.