I skipped thru this thread. I will say that dust on the mirror is not photographed.
Dust on sensor would be the issue in photos. To test, photograph a clean white wall. Dust will be a spot in the same place on every image.
Most manuals have instructions. It's a very delicate process; unknowingly, we can make for further damage. Best left to the pros or experienced.
Never use canned air inside; never blow in.
Spectrum or Concord Camera would be good starting points. Or am email to the camera maker for service.
If you have an editing program, one can set up an action to spot in the same place on each image!
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