Resolved ST-2000XCM Vertical stripes

Hi Folks,
I have a ST-2000XCM which I have used for about 12yrs with a Celestron C11 SGT.
Since new, it has had a blue vertical stripe in the bottom half of the images (see M104 attached).
The images are 1600 x 1200 and the band is in columns 679-681 from row 655 to the bottom.
Is there any way this can be fixed by a firmware upgrade, cleaning, etc.
It is pretty frustrating as the camera is a great "out of the box" solution.

Thanks for your help.
Ken

 

Thanks for the response guys.

I have attached the FIT file.
I can't find a specific dark frame for the M104 image, but have attached another one.
The band appears in the DF also, so yes it counters the stripe in the light frame.
I don't have anything that can open FIT files (only a freeware program) so I generally save to TIF which I can't upload here.
The final image (JPG attached) with DF Subtracted came out ok.
It has always bugged me that the stripe is there, but if you consider it not bad, then I can live with it.
I am getting back into photography after a layoff for many years.
I've been worried that if I start taking multiple hour long exposures and stacking them to remove noise, etc, the stripe will remain.
I will probably get Maxim DL Pro to process images and see how things go.

Happy to know I don't need to buy a new camera.

 

Ken,

The dark frame and the light frame does mot match. They need to have the same temperature and exposure times. Your dark frame is a 300 second at -13 C and the light frame is a 108 second one at -12 C.

 

Thanks Joe,
You’re correct, the lights and darks are from separate images. The PC in my observatory crashed som time back and I lost a lot of data (now I back up to a NAS). I was only showing that dark frame to demonstrate that the banding also appears on the dark.
They do cancel out when I have matching light and dark frames.