I had the Audio Desk twice. The first time, the pump failed and the company would not take it back but merely give me a light discount on a new one. I fell for it and bought the new one (an upgraded model with a better pump). When that pump failed this year, I did not even bother calling. I threw it in the garbage and purchased a KlAudio which works much better anyway. I assume the Degritter will too.
Look around Audiogon and you will see that others have had the same issue. Someone here has a method to open the system and replace the pump. Not for me. I blindly trusted the German engineering aspect. A lesson learned.