I enjoyed your story very much Steve, although it was waaaaay over my head.
Reading your post reminds me of how little I know.
I'm just a simple shade tree mechanic who can replace parts that are obviously broken, but can't really diagnose.
I'm also amazed that after 20 + years there are still things left to learn.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".