Adjusting a Daewoo Picture

I have a Daewoo DSJ-4710CRA rear projection HDTV. The problem is with lining up to colors in the picture. The center of the screen is always crisp and clear, but the further to the side that you look, the worst the clarity. It seems as if one or more of the colors palets is cocked slightly. Reds and blues are the dominant problem. You will see red lines on the left side of oblects on the left of the screen and right side of objects on the right of the screen. This is particularly apparent on text. The convergence function of the remote only allows adjustments horizontaly and verticaly. There is no option to rotate. Please help!!