Is this an expensive replacement? does it need to be replaced? stepper motor? on 2003 Mercedes-Benz C240 4MATIC

A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the climate control system. Disassembly of the center console will be required to access and change the broken arm with the updated, reinforced part.

Asked by for the 2003 Mercedes-Benz C240 4MATIC