Ouch, well, that's what this group is for. To pass on knowledge and help each other in trouble. So any problems are not yours alone, some of us have already gone through them.
I'm not even a certified mechanic, but have been asked by many to help out. Just fixed a sunroof, antenna, viscous fan and radio problem car(1991 350SDL) yesterday.
Walter Klatt
1967 220SL-diesel
1963 230SL-gas