Sova HD LCD TV with Streaks

Good Morning. I have a Sova 32" HD LCD TV Model # DSV32P112 purchased in Feb. 07. A year or so ago, grayish, irregular, curvy streaks have appeared vertically on the screen. The streaks vary in thickness ranging from about 1/4" thick to over 1". It looks almost like a sideways mountain range. You can see the picture behind the streaks,so they are not solid, but range in density, feathering dark to light left to right vertically. They seem to get darker as the TV warms up. When first turned on, they are barely noticeable. Of course, this started after the one year warranty expired. Any suggestions? Thanks in advance!