2006SL65

I have a 2006 SL 65. The power steering pump makes a grinding noise but only when I turn the wheel to the right. It is silent when I turn to the left. The dealer tells me it is just the pump but I’m wondering why it is only noisy in one direction. By way of background, the noise began after a hose blew in the hydraulic system that levels the vehicle and the dealer replaced the hoses and supposedly bled the system. Anyone encountered this?