I will renew my plea to the moderators to forbid posting images of manual AC controls. It's not fair to those of us MBUSA ignored!

I have a manual AC control set from an older 126 and it looks like my long fingers could get to the bulb holder, which presses into the dial unit, from the radio cavity. Follow the blue and brown wire pair that leads to the dial with the bad bulb. If you have an aftermarket stereo, the sleeve might have to come out.

Sixto
95 S420
87 300SDL