Sony Trinitron KV5000, Pink?

[Arcanine]

As I have started messing with my KV5000 more, I have noticed that it seems a little on the pink side. Like everything has a slight pink hue to it. I've messed with the adjustments for the guns, and it helped a little but not completely.

When I turn it on from cold, the screen is very pink, then once it warms up just a little it comes in and looks almost normal. What causes this? I have seen other Sony sets turn pinkish.