A power window switch is a common failure point in many cars. Over time, the switch can become worn out from use and will eventually stop working. When this happens, you have two options: replace the switch or repair it.
Replacing the switch is usually the easiest option, as you can simply buy a new one and install it. However, if you're handy with a soldering iron, you may be able to repair the old switch and save yourself some money.
To do this, you'll need to open up the switch and take a look at the internal components. If any of the copper contacts are worn or damaged, they will need to be replaced. You can either solder new contacts onto the old ones or replace them entirely. Once all of the damaged parts have been replaced, reassemble the switch and test it out. If it works properly, then you've successfully repaired your power window switch!