Date registered: May 2005
Vehicle: '07 GL320CDI
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Its name in EPC is expansion plug on vacuum pump--epc contains footnote "see DTB S-B-01.30/23a regarding seepage from back of cylinder head."
EPC states "no longer applicable," which must mean later models don't use it.
In any event, I'd visit service department to get a chance to read the dtb, as if you're still under warranty they will for free apply the specified fix--which could be more than just replace this part. If not under warranty, you'd have to pay but it would still be nice to know the full details of the problem.
dtb=dealer technical bulletin