NIVONA NICR 530| Coffee/water mixture leaks.

Hello Forum
,I have a small problem with my NIVONA NICR 530 fully automatic.
Actually everything still works fine. I can make coffee, foam milk, etc..
Only unfortunately runs out every now and then at the back of the Maschiene again and again a bit of what.
It seems to be a mixture of water and coffee grounds. So not just pure water.
It is not very much and always comes out at exactly the same place.
It is exactly at the left rear base of the machine.

I unscrewed the baby and took some pictures. I have no idea of the inner workings of a
fully automatic machine so don't expect any technical terms
.
It looks like the stuff comes out of some small hole in the middle of the machine and then runs through the back of the machine and down the base. I have marked the hole.

Glad about any helpful answer, and thanks to all who help me!

the leakage comes from coffee brewing residue that accumulates in the space where the drainage valve sits.
that space is covered with a cover plate and 5 screws torc. if the brewing group is out you can see that plate. remove screws and take plate off. Then you can see the gunk. clean with a pressure plant sprayer and cover everything up again screws in and you can make about 1000 cups again before the problem arises again. is and nivona thingy.