Sony GDM-F520 diagonal lines troubleshooting

I have a 21" Sony monitor and about 7 thin diagonal lines have appeared
on my screen. The look like faint aperture grille lines, but are
angled upward starting at the bottom left. It gives the monitor a
"Candy-Cane" appearance. They do not go away when the monitor is
disconnected from the computer, or with degausing.

Any ideas of what has gone bad?

Approximate cost range to repair this?

I've spent quite a bit of time searching for clues to this problem so
any input would be greatly appreciated.

.

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