Thanks Jim. I was reading a post on another site. For the 123/126 cars there is one bulb that is the light source for the FO system and it is behind the CCU or the radio. I have not taken this area a part yet, but I have a new push button CCU to install. Maybe I can cure two problems at once.

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1987 300D 146K Original #14 Head
One eye on the road, the other on the temp. gauge

Gone But Not Forgotten
1983 380 SEL Long gone
1983 300SD Wish I hadn't traded it in on a 90' Corvette
1989 300SE My all time favorite
1995 E420 Went like a bullet