Amp 2.1 audio output issue

I have been using amp2.1 v1 for some time without any problems. How ever recently the speakers stopped giving any sound. Checked the speakers wiring connections etc and found them to be good. Device connects via the app as well as the web interface. Also tried with the acp work bench and works fine. But no sound comes from the speakers.
Any help to check out the amplifier stage? How can I get a aux out from the board board to connect it to a external amplifier? Does any one has a circuit diagram of this board?