To remove everything prior to the Brewgroup follow this tear down.

This guide begins after tear down step 15

CAREFUL as you remove the brewgroup as it is still connected via the hose till you do step 3.

In the tear down I referred to this as the tamper assembly but another great contributor wrote a guide on this specifically and referred to it as "Brewgroup" so...

My J5 is different enough from the one in the other brewgroup guide so I made this guide.