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Q: I have a weird thumping sound above the driver's rear wheel behind the trunk on 2004 Mercedes-Benz SL500

I have a thumping and bouncing around sound coming from above the drivers rear wheel. It is behind the trunk liner. Sometimes it is loud and other times hardly there. When I unlock the doors remotely I can hear it quietly bumping the walls. What is in there? One guy said it sounds like a hose has come loose from it's holder allowing it to flap around. How do you remove the trunk liner?
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