We will now focus on opening the heart of the Barista: the boiler.

Remove the four hex bolts securing the brew head to the boiler assembly.

Lift the brew head off the boiler.

Remove the single Phillips screw securing the brew screen and gasket to the boiler housing.

The brew screen helps to evenly disperse water across the grounds in the basket.

Use a a large standard screwdriver (we used a washer and a pair of pliers) to remove the one-way valve spring retainer from the bottom of the boiler.

The one-way valve spring is tuned to only allow the valve to open when the pump is running. This prevents the brew head from dripping while warming up.