i have several DVDs which had been offered by MBUSA which I believe are no
longer in production. The one I use for w210 models was pretty decent and
are excerpts pulled from the WIS documentation. The interface is not intuitive
for me but bearable when needed.

The information within was less so a step-by-step, photo by photo but it was
still geared for the model and not generic. I saw the same line drawings found
in the WIS repair service

ebay item # 201936019739

https://www.startekinfo.com/StarTek/outside/7594/?requestedDocId=7594

Buying and Maintaining a 126 S-Class Mercedes by Nik Greene

Mercedes-Benz W 126: Die S-Klasse - Das beste Auto der Welt (German Edition) by Heribert Hofner (if you can read german)

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-- raymond~
47º 34'N 122º 18'W