AST Vision 5L -scematics/geometry problem?

[Esa Elonen]

Monitor is ASTvision 5L, model TE1564G , made march 1994.
The monitor suffers from horizontal linearity problem which eases off the
bigger the refresh/resolution gets, at 640x480/85Hz it's very small ->
1024x768/70Hz it's nearly unvisible, but with lowres modes it's redigilous
the picture get's totally screwed, the witdh in center of picture is about
3x wider than in the borders of the picture like this: || | | | |
||, vertically it's ok, it can't be tuned either . Some part's in the board
has visibly been swapped in some stage of the monitors life, I'm interested
to know the correct values for those parts to see whether wrong part has
been used:

C529
C530
C535
C536
C534
C555
C409
(resistors r563, r 543).

Any other suggestions to fix the problem are also appreciated.

Greetings,
E. Elonen
art...@dlc.fi