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Although the master switch CAN be problematic, if the switches on the passenger side are also not working for windows and locks, it sounds like you have a wiring issue on the passenger door. perhaps some chaffed wires in the hinge area.
Note the full width button above the door lock buttons will lock out the window on the other doors. Down is locked and up is unlocked.
The master switch is easy to take apart and clean.
There's about 6 torx screws (#10 IIRC).
Remove the screws, and take the back off and remove the circuit board.
Most of the "switches" are actually a black conductive rubber pad on the bottom of the key switch that when pushed down makes contact across open traces on the PCB.
Clean the PCB and rubber contacts with isopropyl alcohol or mineral spirits.
Once the conductive rubber pads are clean, lightly or sparingly rub some graphite on them. The type of (dry) graphite you get at a hardware store for lubricating key locks etc. you can use a small Q-tip or micro brush for this. then reassemble. it will be better than new!
This type of key switch is very common on many different type of office machines and consumer electronics, and I have done many thousands of them this way over the last 30 years.
Note: there are a few regular nickel plated copper contacts in the master switch as well. Just clean these and if the contacts are pitted, just touch them up with some 660 grit paper.
Hope this helps.
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