Phosphor burn....Or not?

[rws371]

I have an 8 y/o Mitsubishi large screen (60") that has developed a "pink square" exactly in the center of the display. I have used the user utility to do alignment and other things related to the picture including brightness, contrast, color and tint. There was no improvement in this external tinkering.

1) The square is pink with a light pink fill shade and a pink dot in the center. Is this a Burn? if no see #2

2) Has anyone seen a similar poblem? Is it fixable? If yes how? if No see #3

3) Any ideas of what presents itself in the center of the screen?

Thank you for any ideas. I appreciate the collective brain power of the group! The set cost about $3K and I am not ready to part
with quite yet as it plays super vid games.

RWS