I got the car back today and the Parking Brake works properly now. They replaced the Parking Brake Pedal Assy. P/N 204-420-15-84. I can't provide any cost info as it was under Warranty for us and 0 cost.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 67K
2016 E550 Cabriolet 48K