jvc av56wp30 vertical linearity

center of the picture is stretched..tried changing all caps in the
vertical circuit, replaced vertical ic, tried adjusting service menu
adjustments. there are 2 transistors in this circuit, q401 and q402
that we are unclear as to their purpose. they seem to check ok. this
is a hdtv, center of picture is stretched no matter what mode you are
in.
 
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