Bright spots (bruising?) on laptop display

G'morning all,

I've got a HP Pavilion dv3510nr with an LED display that's a few years old now. Lately the bottom and sides of the display have been tinted yellow, and today the same thing happened in a space maybe two inches in diameter towards the center of the screen.

It's not the end of the world, but it's annoying. Anything I can do to alleviate this (disassemble to relieve pressure or something?) besides replacing it entirely?

It's out of warranty, so I don't think it's worth calling them.

As far as I know, LCD yellowing is caused by excess heat, and there's nothing that can be done to fix it, other than replacing the panel completely. But this is not an area of any particular expertise, so pay attention to anyone who contradicts me.