EGC

My Svt-2 pro recently stopped working. As I started to play, it made a pop/boom noise, all audio cut, and the fault indicator started flashing. I had my amp guy look at it, and he tested the tubes. They are all working. He said it is probably an issue with some of the solid state technology, which he is not savvy with, so I have to send it to a different guy. The only reason I could think of it quitting on me is because I played the national anthem at a basketball game with an octave/fuzz pedal, at a fairly high volume. What do you guys think the problem is?