The backlighting for the buttons on the ACC is fiberoptic. A filiment, sometime two (depends on which switch) runs to each switch. All the filiments come together deep in the dash. I'm not sure where the light source bulb is located.
For the mileage awards, call 1-800-FOR-MERC and ask for an application. Once you send in the completed app, it takes 4-6 weeks to receive your award.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.