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Mirror is the first suspect, but be very careful and avoid cleaning it, have it professionally cleaned. The bottom if the focus screen is also suspect.
Finally, the eyepiece could be smudged, but that is difficult to do.
You can rule out sensor and lens based on your information, remove the lens and look carefully at the mirror. Also try to look up at the focus screen and the eyepiece.
This leaves the internals of the viewfinder assy, but unless you opened them up, that seems unlikely.
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