Kiwick-
Your description of the retrace line behavior (going away after warmup) exactly matches what happens with one or more bad electrolytic capacitors in the vertical circuits. If you or a friend has even basic electronic repair/soldering experience, you should be able to find and replace the bad ones. Likely, they have part numbers in the 500-599 range, based on other Sony monitors.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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