Door Area Rattle
 

Hey, all, first post here. I have a tiny problem on my otherwise perfect '09 370Z. When I am at a stop, there is a rattle in the driver's side door area. When the car is moving, the rattle either stops (which leads me to believe there might be a resonant frequency that is being hit at low RPM) or is drowned out by road/engine noise.

I am able to get it to go away by putting my hand on the panel that runs all along the area directly underneath the window, so I'm guessing there may be something loose in this area.

Should I just take this to the dealership and twiddle my thumbs for the two hours it will take them to deal with it, or can anyone think of an easy fix that I might be able to perform with my limited mechanical skills?

Does anyone ever just punch the panels that are rattling? That sometimes works for me.