I just got a 2000 OBS tahoe z71 about a month ago. I love it so far, but it does have a couple of issues. After I had been driving it about a week, all the power door lock switches quit working. It has them on the driver door, front passenger door, and next to the passenger side trunk barn door. Prior to that all had worked fine, then one day none of them would work and haven't worked since. Not a huge deal, just annoying. Curious about fixes, costs, etc. Any advice or suggestions would be appreciated. Thanks.