The seal on the support valve is heavily stressed. It should always be well greased and also be replaced from time to time.
Opening is described here
The support valve is visible when the brew group has been removed. It represents the connection between the hot pressurized water and the brewing group.
Two big screws hold the valve, here 6mm Allen screws. To solve.
Careful cleaning is very beneficial to the aroma.
The valve is single in this model. Here two seals are exchanged. For other models, it is bolted directly to the heater. In this case, remove the heater and valve and unscrew the valve. You then have to replace three seals.
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