I would take it to the dealer. I would have them write it down on a RO (repair order) so it is documented. That way if in the future beyond what they tell you in the next few days, you have a record of your discovery and concerns. Then if something horrible happends outside of their normal service warranty, you are covered.

Is your car in or out of warranty?

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)