Krups EA 9010 - reports coffee bean hopper empty

Hello,

I have in recent years from time to time indicated that the coffee bean container was empty although it was half-full. Now I get it weekly displayed and now it also happens from time to time when this is completely full.
What could be broken? Is it a sensor? Can it be replaced and what part number does it have so that I can specifically search the Internet for this spare part?

I had the machine open last weekend because I had completely replaced the nozzle unit (no more milk foam -> is now fixed). I think I trust me also the exchange of a sensor if I could identify this and also purchase.


What also occurs increasingly is: My coffee looks and tastes a bit watery.
This was definitely different in the past. What can I do about it?

I hope that someone here can help me because without coffee my wife and I are unbearable.... help...