Panasonic PT-56HX41 Convergence Problems

The picture on my projection tv has gone bad. The colors are seperated. I have tried reseting the convergence, but only helped a little. Still have a lot of problems with the green color seperation. There is a bow at the bottom 1/3 of the screen. I called a repair man and he said it was probably a bad convergence chip. The chip alone is $300.00.
Is there anything else I can try before spending so much money? The Tv is only 3 years old.