Krups XP5240 breakdown

I really like this espresso machine. Most of the times it makes coffee that is enjoyed by anybody who visits my house. It is the matter of good fresh coffee, water, skills and of course the equipment. Nevertheless the last of these factors failed after nearly 4 years of service.
I noticed a leak inside the machine. The easily accessible seals around the filter holder looked fine so I decided to descale my Krups before I go further. Then things got worse. When I had started the machine with the ON/OFF button the pump started pumping water into the tray which is obviously not the desired behavior.
I dismantled the espresso machine. See the results in the video.