You can use a test light to retract the codes from the system or build a LED box like people have described before on here. If it was me I would bring it to an independent Mercedes shop that can extract the codes and give you an estimate of fixing the problem. I DONT recommend DIYers work on the srs system due to the care that has to be taken when working on it.I personally have had people try to do the work themselves and it cost them double due to the damage to the system.
