Last remark, I'm not doing repair videos etc. But as there is nothing on how to repair this great camera. I decided to share my positive experience here.

It was a good job screwing all this metric screws in magnesium body instead of plastic we normally know.

And, yes I have experience with this kind of repair.

Most challenging was the astro-modification of a Sony NEX-6.

So it is not a witchcraft but don't do it w./o. a basic skill of this sensitive work. AND watch the linked video of the opening of the Alpha 77ii before, give a lot of good hints how to manage the disconnecting of the cables etc. Hope this was helpful for anyone and my daughter will have long time fun with here camera.