Sony KP-41S4 projection tv with convergence problem

[Ruud]

The former owner replaced the picture tubes, introducing a convergence error for red and blue. After finding the deflection plug for green switched with blue, i put this in correct position.
The correction made in auto mode is working now, but only correcting the center of the screen, red is way out on the right, blue on the left side of the screen. Correction to be performed thru the screen setup is not possible, i am not able to select "convergence" as displayed on screen

What do i need here: to repair, and how to get in the convergence menu?
The schematics i have, thanks to this site!

mail to: [email protected]

thanks