Built In Coffee Machine I Have A Briel Coffee Machine That Stopped Working Well. It Leaks Around The Cup That Holds The Coffee, Why?

I have a Briel coffee machine that stopped working well. It leaks around the cup that holds the coffee, why? - built in coffee machine

It seems that the buildup of pressure in the container glass coffee. When I retired, and a huge amount of water vapor trapped sale. It is as if the cup is locked. The machine is almost new, however. I do not use the coffee? What could be the problem?