Driving a stock '00 GT Vert. Passenger rear window switch is a problem child. Goes down fine every time. Going up is different. Sometimes works normal. Other times a "Fonzy" type hit on the door panel at the switch area works. Other times, I just ease off the pressure on the switch just a bit and it works. Now for the ?'s. Are the switches repairable or is it a replacement only type item? Can I replace just one switch?