The base module has about 4 fuses. They are the standard AC Delco-type, plastic, flat fuses (I think 10 amp) and can be found at Autozone. The Mercedes parts catalog at the dealer doesn't even show them. They are really easy to access since they are right on top. I talked to an MB shop forman last week and he said that he has seen these fuses go out many times.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles