Plug your bass directly into the power amp in jack on the back. Your bass isn't enough to drive the output stage very hard but you should hear something at least.. If you do then the power amp stage is fine.. If not, then your power stage is toast and it's service time.. If the power stage is working then it's the preamp that is the culprit, and that amp is a digital modeling amp so the preamp will be very difficult to troubleshoot. Again, service time.
I expect the preamp is probably a module and you can order a replacement from Peavey.
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Delusional Mind