Thanks for the reply. I messed around the service menu a bit and found a few more places that might be helpful to look into.
The last major main menu, I think it is initialize (the one just before jump back to the 1st page via mute key), when you scroll down, there are quite a few setting for color temperture default RGB setting for low, mid low, mid, mid high and high I believe. I wonder if yours has been changed or not? Further down, there are a bunch of setting in HDMI INTR POSITION menu that you can enter and mess with. I wonder if you can look at those setting and may be that is where input 2 is tuned.