I actually called one of the 'reset' companies directly (unfortunately don't recall which one) and they basically told me they don't do anything to the Mercedes module other than resetting the code that triggers the warning light and that I could do it myself with a scanner that supports SRS reset. Had always understood that it was a very complicated process, even a friend who is a highly regarded Mercedes INDY didn't know if he would be able to reset the module with his professional level scan tools. I was quite surprised that nothing needed to be done to the airbag control module other than resetting the SRS light with my Autel scanner. What I can say from personal experience is I had to replace six airbags and three seat belts that were set off by a front driveshaft failure on my wife's Mercedes E350.
Let me start off by saying I don't know what is required specifically for your vehicle.
