The only 2 screws visible at the front are two torx screws (1 each side) visible when the door is opened. I took them out but they were just to fix the unit to the cabinet into which it is integrated. I can now pull the unit out a little having taken these out. I don't see the screws you talk about in the front grill...
You never got back to me to explain how to access the control board, as the instructions you did give were obviously for a different unit. Can you please give me instructions - I have the part sitting here and don't know how to fit it.
It's a built in unit.