The problem with your LHR window is more then likely its switch, as long as the white wire at the back of the switch has power in it with the ignition on.
The easiest way to check it is to remove the LHR window switch, turn the ignition on and use a test light to confirm the white wire has power in it. If it does you can swap the switch with the RHR one to confirm.
Your LHF window problem is more then likely its switch as well, once again just confirm that the white wire also has power in it. I'm not sure if this switch is interchangeable with the RHR switch or not, if the connectors are the same it should be.
You can carefully pull the switches apart and clean the contacts or just replace them.




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