This is sort of a DIY fix question, hopefully this is the right place to post it.
Basically one channel of my receiver developed a very noticeable hiss. My troubleshooting puts it in the preamp stage.
I've actually built small, simple amps in my day, but never worked on anything like a modern receiver. Since my troubleshooting put the problem in the preamp, I don't think that would involve any of the more complex electronics like the DAC and whatnot. So in theory, if it's just a problem with a burnt capacitor or opamp I might be able to fix it myself.
I already used this issue as an excuse to upgrade, and my warranty is long expired, so I'm willing to risk messing it up
On what receiver you have depends to Me I do not think you can fix it your self, They are to complex. I would not take the risk, But if it out of warranty all you can do is try But if you try you will most likely make it worse.