Hi there, new guy here.  I've got an amp question, and this seems like the place to ask.  Last night, I had the gain, presence, and secondary volume pretty cranked up, with the primary volume at about 3.  Long story short, I lost my balance and in trying to recover, I inadvertently jacked the primary volume waaaay the crap up. 

The amp immediately decided that it was not in favor of this new configuration, and seemingly a circuit breaker popped, and the amp went quiet.  It turns on, but it's as though the primary volume pot is disconnected.  I now have a very subdued amp.   :grr

So, did I screw the pooch, or is this an easy fix?  My local shop gets $80/hour in labor and I don't have that kinda coin, so any help would be greatly appreciated!
Thanks & be kind to the newbie.