Mitsubishi VS 45607: 1. TV starts out as B/W when first turned on. After about 30-60 min, the color is restored, although not in the full color spectrum. 2. TV flickers a lot vertically. After about an hour, the flickering goes away. 3. Top and bottom borders of the screen image do not stretch out in straight lines.

You have a bad video board. If you can find one used it is fairly easy to replace once you get into the TV itself. Your color guns could also be adding to this problem. I am not familiar with this television and its components so I dont know if you can replace one color gun at a time or if once one is shot then all three have to be replaced. That should be a start for you anyway.