MS8 with dark diagonal lines, slowly scrolling?

Reclaimer

Haomaru's Blade Shiner
Hey all... picture on this MS8 looks excellent (it’s in my Pony Mark III with 25” crt)

However... one last issue is some slowly moving/scrolling diagonal lines. Any thoughts? It’s hard to get a pic, but here’s a closeup. The photo makes it look darker than it is in person, but gets the point across.

Thanks!!!
 

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Reclaimer

Haomaru's Blade Shiner
The chassis ground has continuity to the main ground, but the wire is SOOO thin. I added another, thicker wire to a chassis screw and hooked it into the main ground on the PSU. It helped a little?
 

Reclaimer

Haomaru's Blade Shiner
Got it!! Wired from chassis metal screw to PSU ground and from cabinet body to PSU ground. Lines gone!
 
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