RepairPal Certified shops can diagnose and repair your 2002 Mercedes-Benz CL600. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
I would think it's worth an hour's labor, at your local rate.
If you want to find a specialist, here's a directory link for you:
https://repairpal.com/mercedes-benz-repair-in-chicago-heights-illinois