Directed A802 Help Troubleshooting My Directed Audio A802 Amp!?

Help troubleshooting my Directed Audio A802 amp!? - directed a802

I am director of A802. Recently quit my subs to work only and I think it has something to do with the amplifier. The power button is green. However, the status display of the ESP is usually not red. It is connected to the RCA. The amplifier has the power to do that flashes in rhythm. Anybody know what went wrong?