R 230/ SL 500 – Cracking in the steering gear 🙁

Hello municipality. Did any of you ever have the error ? If the front axle is loaded a cracking in the steering gear, comes from the middle. Is also quite clearly perceptible and occurs approx. with every 3rd steering movement. If someone knows which damper, etc. I have to change there I would be very grateful for a hint. Greetings Armin