Remove the six Phillips screws securing the chrome rear panel to the Barista.
Once the chrome panel is gone, you get a pretty comprehensive look at what makes the Barista boil. Major components include:
A reciprocating pump.
A pressure release valve
A boiler (with an internal heating coil).
A steam valve which, as you guessed it, allows steam into the steam wand for making frothy milk.
A bird's nest of wiring supplying power to everything.
Remove all the Phillips screws holding the AC power cord and distribution block to the frame.
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