Unplug the machine from the powerpoint.
Remove the plastic base of the machine by removing all visible philips head screws. You will then see the pumps and wiring.
There will be 4, maybe 5, small philips head screws that affix the metal cover plate over the PCB that are undone from the base of the machine.
Once these are removed, pull down on the metal plate and the big white PCB case will be exposed. There's a few more philips head screws that hold the plastic cover over the PCB. remove them to gain access.