I think you are in way over your head. Take this to a mechanic who is familiar with these and stick with doing whatever it is you do best. These systems can be very confusing and complex if you don't work on them daily. Think of this as a burden taken off of your shoulders I hope! Good luck with the repair.
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM