Are you familiar with electronics?
If and/or when the red led light is flashing it means the device is in protection mode.
1: check voltage regulators 5v and 12v which are the important parts to keep the device operating.
2: if there is a short circuit on the power amp, meaning the power output of the receiver.
3: check output Transistors.
Hope this will help or you can give these to a technician that can help you.