Well, today after work, I crawled under the vehicle to confirm the part no. and it is a 13-00 suffix as stated on the service invoice. It appears that we are now up to design change number 13.

I sure am thankfull that I had mine replaced and Mercedes picked up the tab under my new car warranty. I am starting to believe that with all the new technology being applied to these vehicles, you have two choices: (1) Lease them for no longer than the new car warranty or (2) purchase them and also purchase the extended warranty offered by Mercedes since you will probably use more than the warranty cost. This is the only way that you will have any kind of peace-of-mind in my opinion.