Thank you 97slsix and pcmaher for your responses. Your insights helped me a lot about how to approach these problems on the W140. It is definitely not your average car and takes much thinking about chasing a problem. PC Maher, your website is awesome and very helpful. Thank you very much for sharing that info with me. I am also learning about how to replace my instrument bulbs thanks to you. You have both saved me a lot of money and kept me from a wild goose chase. The dealers are only too happy to sell expensive parts and repairs on these cars. I agree - Long live the W140!