1. You’re going to have to remove the control panel face to access the wiring behind. Disconnect any 12 volt supply to your rig.
2. TAKE PHOTOS of the wiring connections to the affected switch.
3. Remove the switch and see if you can get the correct replacement switch at your automotive supply store, or a well equipped RV parts dealership.
4. You should be able to verify the switch operation before closing up your panel.