Hey guys I'm new here and new to working on amps

I have a line 6 spider III 15watt amp which had a problem where it was extremely quiet even when cranked. I figured I would pull it apart check for anything obvious then put it back together.

Upon putting it back together I managed to release the smoke stored in the electronics. I found a fries diode and replaced it, I also checked the other diodes and all good.

Now I turn it on I get a hum from the speaker, checked and found I had 10V DC there.

I also checked the power amp which had a 13V DC supply and 11V DC output. Input was about 0.8V and volume was all the way down.

I studies electronics a long time ago so I am comfortable with replacing components but would appreciate if you guys can help to guide me through the trouble shooting process