How to change PCB in Daewoo FRS-2031IAL?

The fridge and freezer keep changing set points by themself with annoying beeps in rapid succession. This stops for a while then kicks off all over again. The set point buttons themselves do not work when pressed so it appears to be a fault on th PCB.
Tried using the "LOCK button" to stop this happening but doing so rapidly defrosts the freezer side. Not recommended.
Seen the PCB for £89.99 but don't know if it is accessed from the front or from inside the door with the ice dispenser removed.