2003 Mercedes Benz E500

Suspension problem
2003 Mercedes Benz E500 V8 Two Wheel Drive Automatic 79500 miles

I have an air leak in the suspension system. The back left goes down when the car sits but comes back up after starting the vehicle. Sometimes I have to move the vehicle a little for it to come up.

First, what could be causing the leak?

Second, if it's a shock, how much do these generally cost to replace?
October 13, 2009.

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