W520: left speaker problem (high-pitched sounds)

my W520 right speaker sound really bad when playing high-pitched sounds (e.g. Windows-Sounds, Windows-Speaker-Test-Sound).
check out the video
http://youtu.be/saR-9jlens8?hd=1
the left speaker sounds pretty good, so I guess the mainboard/driver shouldn't be a problem.
is there a way to get a replacement speaker?
does anybody has or had a similar problem?

Hi stifu
Yes, just use the Windows test on the last few seconds to prove the tech that the right speaker is faulty and they will replace it for you. I have met the same problem before and I have the speaker replaced once.
Have a nice day!
Peter
W520 (4284-A99)
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