Taking a dump usually means they are going to ****lol sorry couldn't help my self
There is nothing you can do but replace the amp sorry...The hissing is one of the symptoms they have. Eventually it won't work at all or you'll lose certain channels (speakers.)
Only thing you could try before getting a new one is open it up and if you can solder.. If there's a bad solder point you could attempt to fix it but typically they just get replaced because the outputs burn up and don't work or hiss.
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