@livenlearn … this is a failed tab driver for your panel. it is either a loose connection or on its way out. you could try and take the bezel off and gain access to the tab it corresponds with in that section. gently apply pressure to the tab and see if the line dissipates. if so, you can wedge some soft foam and re assemble the set. at some point, its going to fail completely. if its under warranty, act now. if not, prepare yourself for a new set down the line.
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