Something is off in the unevenness of the sky in the image that Kino modified. There is a bit too much of a definite line to the light/dark transitions. It almost looks as if there was a film spool sitting in chamber with light coming through- a shadow in the middle, two light-struck areas, then pretty hard lines on the outer edges (with a secondary reflection to the left?).
That isn't the look of agitation problems. That's the look of light leak problems. Subtle. A stray LED on a charger in the room? Static?
And more confusing is that it is not typical direction for light leaks from either the dark slide or from the back itself. They would usually run left to right, not top to bottom?