Sony/Sun monitor has"wiggles" at top of raster

It's a Sony GDM 20D10. It has recently developed a problem with
horizontal "wiggles" at the top of the raster. The wiggles displace the
scan lines to the left and right by a short distance, in the upper
quarter-inch or so of the raster. They do not "move"; they are
completely static displacements of the scan lines. They do not "scale"
with raster resolution. There are about five of them in the top quarter
inch.

Not there when the monitor is turned on, they become more prominent as
it warms up. If I shut it off for a while, they're gone when I first
turn it on again. Recently, the wiggles have been evident further down
the raster, but becoming progressively smaller as they go.

I suspect a part (probably an electrolytic) is going out. Can anyone
suggest which one(s) I should attack first?

Isaac

 

Well, I googled the heck out of "GDM 20D10" both with and without
"dkuhajda" or "david" and came up dry (except for the present thread).

I'm no newbie to electronicdesign/repair or to monitors; can you give me
a hint?

thx

Isaac