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There's one on the back of the MCS itself, need to pull the radio to check it. On some of the earlier MCS units (2000 model year, maybe into 2001) there were some problems like this. Possibly the dealer can look up the bulletin and maybe MB will stand behind it. In the cases I am familiar with, the easiest cure was to remove the MCS, disconnect the power connector, then reinstall it, enter the security code and it'd work fine. For some reason just pulling the fuse wouldn't fix it. You could also disconnect the battery, as long as you realize you'd need to reinitialize the steering angle sensor, clock, trip computer, sunroof, etc as neccesary to get everything working again. If that fixes it, I'd see if the dealer can help out, known problem.
Gilly
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