getting to power board and schematic?

hi, my neff c17wro1nob microwave has failed again looks to be same problem power board which cost £350 last time so i want to change or repair it myself this time, it looks on first inspection not obvious how to get to the boards if someone can guide me on that and also having difficulty locating a schematic tia, steve
steve, February 2021


link Click here to see other fixes for Neff.