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I bought a Sony KDL-55NX810 right at 2 years ago - Feb 16, 2011.
I didn't buy an extended warranty. Now it's developed some discoloration on the left side.

The discoloration appears on any HDMI port or with no signal at all. It doesn't get better or worse as the TV warms up.

Looks like I'll probably be fixing this myself, if possible. A forum user on another site says it's an LED backlight issue but I figure the level of expertise is better here.
Any ideas exactly what may be wrong and how to fix it?