plasme tv noise at 700 foot sea level!

I have a JVC 42" plasma tv (ed)and just recently it began to make a buzzing noise (high pitched) when the tv is on. I don't have cable or sat but am using a amplified antennae for tv reception. I can still hear the noise, although not as loud, when I play DVD'S. I live at 700 feet above sea level so the high altitude buzzing should not be an issue. I have had the tv for 1.5 years now. I have an extended warr. on the tv . I don't know if I should live with the noise os send the tv in for repairs? Any suggestions?

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