The first thing you need is a fairly comprehensive toolkit. Note (except for the "weird bit" setting), there are no really professional tools, just metric wrenches, metric sockets, screwdrivers, pliers, wrenches and hammers.
Unscrew the top four screws and remove the top panel of the coffee machine.
Unscrew two small screws with a Phillips screwdriver as shown in the picture
Look at the water tank, you can see a screw in the opening slot, unscrew these turns, and then take out the rear panel.
Unscrewed 2 screws and washers (excluding washers) and removed interior panel
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