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Ok, the codes dont actually tell us if the wheel speed sensors are bad or not. They tell the area of concern, in this case the speed sensor circuits.
The shop should test the speed sensors with a Mercedes STAR scan tool to see if they are bad. If so, replace them. If they test good, then the wiring harness has to be tested for short to ground or open circuit and repaired as needed. IF both the sensors and the wiring are good, then the ABS control module is faulty and needs to be replaced
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Sorry, I missed the S status. Yes, that means they need to be replaced.
I am in the USA and it is not cost effective for me to call you.