injector leak 99e300d
 

I am experiencing a small leak out of the top of the injector pump below the connector plates that hold the lines in place before going to the injector. The connector plates that are splined and screw in the top of the injector appear to look like they affect timing on the pump? Is this a DIY job to replace any seals underneath this or is it a MB Shop job?

thanks for the response in advance