How do i get to the main board in my hotpoint FFA45W fridge freezer?

Hi I have found the fault with my hotpoit fridge freezer, but cannot get to the main board to fix it.

The main board is situated behind the fan in the back of the fridge section of the fridge freezer, the problem is the back is sealed on and when you try to cut through it its full of expanding foam, so i dont want to cut out all this expanding foam and I am sure I should be able to get to it another way?

Does anyone know