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Howdy
Could you open the shutter using the sensor clean thing and use a bright torch to look closely at the sensor and see if theres a visible mark on the sensor. Could you also post up an affected image.
It seems that if it is a stain rather then a single line its not a scratch or dust, perhaps some oil or somthing somehow got on the sensor window. You cant remember exactly when it happened, or what you were using the camera with when the first affected images started happening?
Scott
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