So I just scored an svt4 pro with 2 pr410hlf cabs. When I was testing it out (in stereo) I didn't notice any issue, but then when I got it home and hooked up the bridge mono cord, it was lacking in power and distorted sounding. At first i though I made the cord wrong, but double checked it, and it was right. So I then tested out each amp side on its own, and its the B side amp. A side is clean w/ lots of power. B - farty, very low power. I was hoping maybe it was just a tube. So I bypassed the preamp, plugging a sansamp RBI in. A side fine, but B-Side same issue. Does this sound l like anything that can be fixed at home or easily? Or am I facing the repair shop. Any advice would be appreciated. THX!