Panasonic PT-53WX53G was fine since 2004. Started showing picture with top and bottom portions sort of "folded" (only blue color). Convergence: 1/3 of the screen (horizontal band) in the center looks perfect, but, in top and bottom blue crosses are way off, distorted, will not converge. Convergence failure? How can I repair it, what shall be replaced, can I get any instructions?? Willing to do it myself. Somebody suggested replacing vertical output.