If youse were to tell what portion of the Sunshine State the Intended was in
Someone here could more easily direct you to a Known Good Shop.

BUT , Since Google is always my friend:

https://www.google.com/search?q=Known+problems+with+2004+W211&oq=Known+problems+with+2004+W211&aqs=chrome..69i57.14727j0j7&sourceid=chrome&ie=UTF-8

For instance:
If I were in upper middle Florida I'd take it to SteveBFL in Gainsville for a Pre-purchase inspection.

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'84 300SD sold
124.128