I only have the Factory Service Manuals for the w123, so I'm not sure what Mercedes published for your car. Perhaps the folks at 1800Mercedes would tell you which manuals they printed?

I found my manuals on the for sale section of peachparts. I almost bought them on ebay, but found a better deal here.

For the w123, Mercedes provides online versions of their manuals, but the image quality is very poor. Perhaps there are similar manuals online for your car.

Good luck (never mind, don't rely on luck )