We've had our Sony KP-61HS10 for about 5 years now, and all of a sudden the green projector has gone bad as shown in the picture below. It holds convegence across most of the TV except in the upper left corner. I've tried Flash Focus, resetting the TV, and manual convergence, but nothing makes any changes. Any idea on what might need to be replaced? The circuit board controlling the green projector, possibly? Ballpark estimate on repair cost?