I was cleaning my 115 combo with that air in a can (???) and when I put it back togeth and started to play I heard a "pop" and smelled burning. I took the amp head out and saw a small amount of white smoke. I know I blew something, but what is it? I have been having trouble with crackling in the volume pot (reason I was cleaning) could that be it? what to do... I don't know any places to take it near my area and I don't have a warranty as I bought it used.