Hitachi 50UX7KC Convergence

[makobe]

Hello,
My 50UX7KC Hitachi projection tv is having severve convergence problems. It will work perfectly for up to 3 hours sometimes but then the picture starts to flicker and the colours become misaligned. When I enter the menu and try to reset the convergence, the blue and red lines bounce around.
Would this be the covergence correction PWB?
Could anyone help me? [/i]