I've fixed a bunch of those where one display went bad. The glasses used to be only about $25. It's a total pain needless to say. If the glass is $100 plus shipping, I'd recommend buying one of those new LED replacement ones. i've bought a few and they look phenomenal AND eliminate the need for the +100/-100V power supply.
You can usually pick them up on eBay for about $165.
But if yours went bad suddenly, it is probably just a broken lead or two on the glass. Sometimes impossible to fix if it broke inside the glass area.
John