Negro de Pazos

Hello! After two years of fighting my W220's mood swings, spending crazy amounts of money, putting more effort on my car than on my degree and visiting my mechanic more frequently than I visit my family, I can confidently say that I've finished reparing big things. (Complete engine rebuild, new everything pumps, new drivetrain, new suspension, new EVERYTHING, in one of the smallest south american countries; where you have to personally import everything). Now, I'm up to minor, enjoyable, repairs. Being the disgunstingly heavy smoker that I am, one of the things that drives me nuts is the absence of light in the ashtray. It has never lighted up, but I assume it should. Do you know what kind of bulb it uses? How do I replace it? Thank you very much. I've lurked MBworld this two years and you all have been very helpful.