2006 Mercedes Benz ML500

Computer problem
2006 Mercedes Benz ML500 V8 All Wheel Drive Automatic 47000 miles

Just took my ML500 in for Oil Change and had them correct a maintenance message for both L and R brake lamps operating on secondary bulbs. They changed oil and replaced both bulbs along with 2 new bulb sockets as I was told they have new bulb assemblies available since 2006. Brought vehicle home. First time I started vehicle I get " VISIT WORKSHOP" message. Called dealer service and the guy said I should be getting an additional message as to what the problem is, but I don't. Any insight would be greatly appreciated.
January 4, 2010.

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