I had a some what similar problem, I noticed a vertical line at ISO 2500 one day recently. I rarely shoot this fast but on examination of images from ISO 2500 to ISO 640 I noticed the line was present in every image which had a dark background where the line would begin. It was not there if the background was bright. I also noticed but not always a stuck blue pixel along the line. Some raw processors tend to map stuck pixels but I noticed aperture when loading the file would display a rough Jpg in which it was visible and replace it with the raw in a matter of milliseconds where the stuck pixel was not visible but the line was there.
I sent the files to Solm for their comments and they requested the camera be returned. It arrived last Friday and I'm waiting for the service order confirmation to be sent back as to what remedial action their taking. Needless to say this is a Nov 06 camera fully upgraded and the line only started to appear in the last 2 months.
It seems to be becoming more frequent judging by the post I've been reading here. I'd not have really noticed it until I shot ISO 2500 but now I know where it is I see it in most of my dark ISO 640 images. Ignorance is bliss (sometimes)
