Hello To All,
I have obtained a copy of the service manual, the plastic
plugs on the four corners of the back do nothing , to remove the back -
remove the three screws from the panel with the two scart sockets , remove
the two screws from the bottom edge of the back , underneath at each corner
, on the top edge of the back where it joins the front case there are two
small slots ,one each side, insert screwdriver and push down to release
plastic clips, back comes off.
Cheers John Ely.