I was hoping the brain trust at DL could help me figure out a problem I am having with (I believe) my STX-16803. I am using an SBI FW on a Tak FSQ106EDXIV. Camera is cooled to -20C. On one side of my images, the first 8th of the frame (from about column ~60 to 550) has a prominent vertical light signal running from top to bottom. This shows up on all my subs, with all my filters, on every subject I image, and is always on the same side of the frame (i.e. columns ~60-550), independent of where in the sky an object is being imaged, pre and post meridian flips. Problem shows up in 15 minute NB subs and 3 min LRGB subs. I am attaching two consecutive subs (pre and post meridian flip) in case that helps in the diagnosis of the problem/solution. Happy to provide any more samples/info needed. Any ideas what might be leading to this? I've read and reread the manual, but can't figure out what could be causing this or how to fix it? Any help would be truly appreciated. At the moment, I am forced to treat the camera as if it were 25% smaller along the x axis than it is in order to avoid having any of the object fall into the problem area, which is defeating the benefit of the wonderfully huge sensor in this system.