New Dell Streak 7 wifi left speaker DOA

Hello!

Just bought new Streak 7 (from Amazon). Everything was ok, except left speaker didn't work from first start. I though streak 7 got only one speaker, but later consulting manual I realized it got two (stereo). I've checked it with mp3, youtube, movies, games, tried various volume options, factory reset - left speaker simply doesn't work.

I hope it is covered under warrany, but I can't find the RMA form in Support section.