2006 Acura TL Creaking noise when open/close trunk

Noises problem
2006 Acura TL Front Wheel Drive Automatic 28000 miles

My trunk has been making a "creaking noise" whenever I open/close the trunk. I call it a "coffin noise" and it seems to come from the driver side of the trunk.

I've asked the dealer about it twice. The first time, they told me they lubricated it and it was good to go. But when I got home, it still did the same thing.

This last time I asked about it, I was told it was a "tortion bar" (sp?) And that all cars made that noise. The guy even went so far as to say all the cars on the showroom floor would make that noise if we opened the trunk!

I am at a loss as to my next steps -- I am aggravated with this sound on such a new car.

Thanks. Allison