Like Steve, I don't recall having them on my 2002 2720SL, but I do have them on my '06. Drainage sounds right to me, although I can't for the life of me figure out what is being drained, and why it needs draining. Vince's explanation (in the thread that Paul referenced) sounds reasonable, so I guess I won't mess with it. More to the point, the fact that they appear on so many TMs suggest that they were put there on purpose, and should NOT be plugged.
On the other hand, if you decide to plug them, let us know the outcome. We're all curious!
Bill
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