on every photo I take I have a thick diagonal black line appear on the photograph. See an example picture: https://imgur.com/a/pURaYPO
My next discovery came when I selected "Sensor Cleaning: Manual" in the camera options which makes the mirror move up and out of the way of the sensor. I then took a picture looking at the sensor. There is a thick plastic thing in the way of the sensor. Here is a picture: https://imgur.com/a/sTEBYbZ
Does anyone know what this plastic thing in front of the sensor is? It is still attached to the camera so I cannot pull it out.
From what I see this is element from the shutter. And my humble advise is to send your camera to repair shop, give it in to the hands of professional, do not try to repair it.