HOW CAN I FIX MY CONVERGENCE PROBLEM?

I have a four year old Mitsubishi 55-inch rear projection television, and I am having convergence problems with it.

The genesis of this problem may have been an electrical surge while we were on vacation.

The symptoms are as follow:

1. When I use the internal convergence diagram (a cross, on axis blue, and the other red), it cannot bring the blue and red completely together.

2. I go to the advanced convergence feature and get a grid where red and blue are not connected, but are a way off from the center (green) grid. I work to bring them together, and never quite get them to match (except in the absolute center of the screen). Sometimes it fixes the problem for a day or two, but it always comes back. It takes a LONG time to do this convergence because the grid is usually curved too. If I can get the perfect squares grid, convergence is relatively simple and quick.

I am at my wits end with this problem. Can it be fixed by me, or do I need to hire some technician at lotsa money?

I'd appreciate any help you can offer.