My driver's (only) door lock won't commit to one position or another with the power door lock button. It seems to get hung up in the middle. I've tried "exercising" it manually to clean it out. No effect. The "action" feels normal when I switch it manually from the inside door "nub" above the handle.
This happend a few months ago and corrected it's self over the course of a couple weeks. Now it's back. Maybe it's the humidity? Is this easy to fix?

Thanks for input.
95 T100 SR5