Color/white balance shifting with bright white screens

[TheRetroCarrot]

I'm currently building a cab with an RGB modded kv32s42. When a white image takes up 50% or more of the screen, my color balance is off, whites become cold green/blue, blacks fade. If I run the High Voltage Reg. test in the NEC test program which flashes between white and black this is extremely visible. Anybody have any ideas what would cause this? Part of the board needs recapping? Otherwise this set has an excellent image. This isn't the end of the world since there is almost never a fully white screen displayed in a game, but it can make some things quite unpleasant like the character select in King of Fighters, etc.