Turn the breadmaker up-side-down and undo the 5 screws in the base (Pink arrows). Some of these screws are probably anti-tamper. If you don't have any anti-tamper screw bits, you may for example need to cut a slot in a flat head screw driver (or go to your local repair cafe for help with this bit)

Turn the breadmaker upright again and gently push and partially (because they are also connected electrically) separate the top and base covers. Note the base cover is also held in place by 9 plastic clips, which may need slight bending.

When partially free, move the top cover to get better access to the 18 pin connector on the main board. On models 48280, the connector is secured with hot wax. This is simply removed using a drop or two of methylated spirit (or similar alcohol) and the hot wax will fall away allowing the connection to come apart.

Model 48281 has a connector with a clip which must be depressed to open the connection. The top cover can now be removed.