bx bomber

I'm new here so this might bew the wrong place. I heard a "pop" sound from the sub. I changed out the fuse like everyone else has done. Now the left speaker doesn't work. The right speaker and sub works fine. It works with headphones. If I switch wire from satellites (right to left), the left speaker works and the right one doesn't. I opened the sub and the one fuse I saw looked normal. Is there another one I didn't look at? I don't want to send the amp back for $75 if I can fix it myself.