Local Mercedes dealer should be able to get you the code. If you want to talk to Cleeve directly, just follow the link in his signature, and call La Jolla Audio. I've talked to him a couple times about Bose amp repair for my W140.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles