I recently brought a used Sony A77 as a backup camera. And I finally shot it for the first time last weekend and noticed the images not as clear as they should be while editing. So I took the lens off and noticed a scratch in the translucent mirror. I should have check the camera out good when i brought it so I blame myself. But I have owned several Sony's from my A 57, A65, A99, and A99 II and and have never had no is such issue. How is easy is it to change this mirror out.?