liebherr bio-fresh problem

Hi, i've got a customer with a liebherr f/f, freezer on the bottom and bio-fresh compartment on top
and the food is freezing in the bio-fresh, turning the bio-fresh off at the control panel does nothing it still ices up on the evaporator. Theres two compressors but one control board and one main p.c.b. problem is do i change air and evaporator sensors or main p.c.b. My other thought is would i need to change the control board aswel.
I didn't want to change parts for the sake of it and thought someone might of had this before.

Thanks tony

change the sensors

Thanks for reply tonto33 i will change both sensors, i've haven't been to the job yet but it was when she said it wouldn't turn off at the control that made me think of the board aswel

tony