Thanks guys, got it up and running again, tried the effects loop and got sound via that, so assumed it was a valve, cracked the amount open and switched the valves around, they don't look blown, maybe it came loose . .either way it's working again and will be ordering some new valves
Thanks guys!
So Andy said:
Try bypassing the effects loop with a short 1/4" shielded cable.
Also, it's possible that you have a bad tube (valve). Try substituting a known good 12AX7 into each of the 3 tube positions and see if the sound comes back.
Otherwise, you will need to find a technician or service engineer that is experienced servicing class D amps. I can support the Fender service guys, as well as Sutherland Trading and any Mesa Boogie authorized service center if they are willing to work on it.
Best regards,
Andy