Instructions needed: Replacing a shutter on a Canon EOS M3.

One of the shutter blades on my EOS M3 hangs in the image area after shot. After unscrewing the lens and carefully pushing up the hanging part, you can still take a new picture and also record videos, but of course serial pictures are not possible and a quick reaction with further pictures to motif changes is not possible, which of course bothers.

I got a new locking mechanism and now want to replace it. If necessary, I will go to work without instructions, of course it would be better to have some about on how to open the camera. If nobody can help me here, I'll try to get a defective EOS M3 to study the structure beforehand.