It's find and resolder or replace. They sell each side independently, so the choice is yours.
fyi it's 8-12 of labor if an indy is doing it.
If you have headlight adjusters, they throw the lic plate light error too. I gave my old harnesses to Scott H., so he'll have to tell you his success if he even got to it.
I hvae new harnesses and both my lift switches are acting up; I think it's the actuators this time, as I cannot see any wear or unusual rubbing up in the window hinge area.
good luck