troubleshooting static in punch 45HD

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Hi!

I'm kinda going in blind in this one. Amp powers up. Right side plays fine. Left side plays fine a minute or two then bad static. Signal is still there, but static covers it up. adjusting gain doesn't affect the static.

I pulled the outputs to test, except I can't find any data sheet on them, SS254 and SS264. So not sure really what to do here. I touched up solder points on the cards and pretty much everywhere.

So I'm kinda stuck.
 
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