My Code 100 amp just dies off in the middle and comes back all of a sudden the volume just fades off for a while and it comes back at will. Even turning off the amp and on does not solve the issue but somehow after a while it becomes normal again. It seems to be some sort of a volume issue... When I crank the master volume knob to full , I hear faint sounds of my guitar. It comes back after a while automatically but then stops again at random.
I had the same issue, Marshall repair center changed the power supply transformer