Can you help me locate the area on the circuit board which is
causing an intermittent fault on my CRT monitor. I would welcome
some help to work out which part of the circuit board is a
candidate to specifically try the next time it happens.

It is a Tatung Mitsubishi V70. Model VM71RDA. (17inch)

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HERE ARE THE DETAILS

This fault causes the picture to move vertically. This might
happen only once every two days or it may happen maybe four times
in a day.

The bottom of the picture will go up by about 1 cm and the top
will correspondingly come down by approximately 1 cm.

I notice that the picture at the top and bottom edge is no longer
"linear" but appears squashed: I can see the small icons in XP's
Quick Launch bar looking all squeezed up.

This effect may not be stable and it may move into and out of this
squashed state every half second or so.

I can't help but think that the effect is partly linked to what is
on the screen as (I may be hallucinating) there seems to be a co-
incidence sometimes between the start of some screen activity and
this fault starting.

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I have removed the rear cover and settled the monitor on the desk.
There is a single large circuit board. I find that if I randomly
(!) press the circuit board (with a length of plastic for safety)
then I can get usually this fault to settle down and go.

I move the board at random because I can not tell where this
problem is located. I imagine there is a crack or bad joint or
something. Sometimes I fancy that moveing the heavy thick signal
cable is helping but I think doing this is really flexing the
board.

Can you help me identify which component or which area of the
circuit board is a candidate to specifically try the next time it
happens.