If my D200 exhibits long banding, what can be done to minimize it?

If you experience this, Nikon will, without charge, evaluate your camera to determine if adjustment to the camera's image output level is required. Adjustment, if required, will optimize the camera's image output level, thereby reducing visible banding to a minimal level.

Nikon Technical Support personnel can evaluate an affected image file to (1); confirm that your concern is associated to vertical line artifacts and (2), if adjustment to the camera's image output level will address the condition.