Fuse blow out on Valveking 112 and Amp Won't turn on again

[perrarina]

I'm an owner of a Valveking 112 and after maybe 6 months of use (In home and two or three times practice with my band), one day, while I've been playing in a low volume environment the amp makes a noise like a bad tuned radio station, the fuse blow's out and a bad smell came out from the amp. I tried to turn the amp on and nothing happen.
I change the main fuse and the story repeat again. I check the speaker connection (I changed the original for a Celestion Vintage 30).
I opened the amp, and check everything, so near of the power valve socket was a little
part of a "Electronic Route" totally burned. I taked pictures.
I changed the fuse, test the amp without valves, but the damage get worst.
I replaced the tubes and same thing happen.
As I saw before I'm, posting photos Showing the board damage...
In my town don't exist any technical service that repair valve amps.
If I change the power tubes could I solve the problem?
Where can I rebias the valveking (I have Groove Tubes 6l6gc)?
Suggestions?
Thanks.

[trevorus]

That carbon gunk needs cleaned off, and those traces need repaired. Also, you need to see if you have a shorted component in there, because something got hot and caused that. What's on the other side of the board where the burn is?

[Enzo]

I think he had an arc there. That isn't heat from the far side. And there isn't anything over there anyway, just a bare jumper wire. One of the flyback diodes is next to that area and merits a check, but that all looks like arc damage to me.

There is a very good trace art image in the parts layout in the schematic.