Siemens EQ 500 - no more coffee

Hello everyone,

I hope you can help me.

Our Siemens EQ 500 (purchased July 2021) has not been delivering coffee for a few days.
Whether coffee or hot water, it almost does not arrive in the cup.
Milk frothing, on the other hand, works.

I have decalcified several times and also thoroughly cleaned the brewing unit (which I do regularly anyway). Both without success. The seal in the brewing unit also looks very good.

I have not (yet) dared to take the entire brewing unit apart.

When I look at it with the door open, it looks like the water is leaking into the drip tray somewhere in the back.

Does anyone have a tip on what I should sensibly try before ordering a new brewing unit (which then may not have been the problem)?

Thanks in advance!

If necessary, I can also attach photos.