I recently purchased a 1996 328is. It's a great car, but I have pixel display problems with the OBC. I was reading another forum where there was a similar problem with the OBC in a 91' 850. Apparently the fix is to remove the OBC and check the solder joints, then resolder the joints that seem to be problematic. Is this a common problem, and is it as easy to remedy as mentioned in the other forum ?