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Because this "feature" is at the lower part of the image, it means the obstruction is at the upper part of the light path.
Definitely auto-focussing mirror (it is behind the main mirror).
Probably the (plastic) pin that keeps it closed is broken. This was notorious problem with 300D and 350D cameras, according to various reports on the web.
Good excuse to modify the camera.. because it has to be dismantled in order to insert the new (metallic) pin.
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