My OnStar light in the rear view mirror is glowing a beautiful red color! I had OnStar run a diagnosis and they came back with a B2470 error code. I looked online and it seems it's an issue with the antenna (either just a malfunction or water leakage). Anyway, has anyone on here had this issue? If so, what action did you take? I've read where people have taken their vehicles to the dealership and the dealerships had to remove the head liner....sounded like a nightmare. As my Yukon is no longer under warranty, I'm trying to avoid costly dealership repairs and wondering if there is any kind of a do it yourself fix.