My Jura coffee machine doesn't pour espresso The machine operates okay with milk, but when espresso program is activated, machine acts like it is making it (grinds coffee, than heats water) but nothing comes out of the tube. The milk steaming part operates as usual. 

Have anybody had experience with Jura maintenance? What are the steps to point a problem?
Probably the grinder or the brew group are clogged. You might want to open up the machine and clean the burrs and the brew group. Afterwards, grind coarser and make sure not to use oily beans.