Intermittent Vertical Lines on Vizio e50u-d2

Intermittent Vertical Lines on Vizio e50u-d2 I have a Vizio e50u-d2 that has intermittent vertical lines. They seem to appear on their own after a few minutes to an hour. They go away if I press on the back of the unit on the VESA mounting holes. Where should I start troubleshooting? ANSWERS:
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