70d is producing shots with prominent white streaks! Cleaned everything. Sensor issue!? Thoughts?

My 70d suddenly started taking shots with a PROMINENT white streak! The smaller the aperture the more prominent it is...this led me to believe it may be a dust issue ( although I have never seen dust accumulate this way) so I thoroughly cleaned everything. It didn't seem to help. Any thoughts? It seems as though it might be a sensor issue...which I would hate to replace!
Solved!
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Looks like a shutter problem.
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