So I pulled out my RCI2970n2 from retirement, and here are the symptoms: it has an on/off amp switch. Amp off 10 swings to 40. Amp on 20ish swings to 40. This is on s real peak reading meter. The power supply is more than up to it. It is running on a brand new power supply cable from Bells. Got a good guess so I can determine to invest in a repair or just leave the amp off and run it into an amp?