ECAM 23.460.S - Water in Grounds Container Returns: Hard Water, Clogged Nozzles, and Descaling

Hello, a few months ago I joined a similar topic but the problem stopped.
Currently, I have this problem again, I even gave an express to the site with an additional failure. I did not use the express for some time and the nozzles were completely clogged (the water in the Opole region is extremely hard). On the website, I described exactly both problems, I picked up the equipment after 3 weeks, did not check it and went on business trips. I'm going back home, we are descaling equipment, I'm making coffee with the hope that I will finally drink a decent drink here, Of course, they cleaned the site but forgot the main problem as they said on the phone.
No damn thing .. and because I like to fix everything myself I stripped the express. And here such a view after returning from the site.

I dismantled and now as you can see in the pictures there is a massacre (sometimes I had the impression that in the coffee grounds container one coffee half the water went into the cup half the container.) You can see that there is a leak or from a hose (from the heater side you can also see splashes of water everywhere) or from this yellow something (unless you are mistaken it is a thermoblock) I stand in the place I don't know what to order. Should there be water in this yellow container ??

I am asking for help and finally I will take you to the site again but I would prefer to mention it myself.

It should not be..
The manufacturer recommends replacing the complete generator, however, unless it is cracked inside, which happens very rarely, you can replace it yourself in the middle of the O-ring, but this is a lot of work ..

The water in the grounds container probably leaks from the brewing unit connection.

The brewer looks quite good, only in those places where I marked 1 can you see a larger stone. So either he sprays water from this hose or I don't know anymore. I will also replace this red O-ring which is at the end of the generator and I will see that I can put on a hose clamp.

I have a similar problem, but I see that when rinsing the coffee machine drips when it turns on the grounds container. The second thing is, if the brew unit turns up, it is inside a rubber band a few mm wide
I fell out and I don't know where to push it.

this eraser you push into the notch that you can see in the picture opposite this eraser