The on/off light on the unit flashes red. I have looked at the manual and, as instructed, have inspected the speaker cables and connections and can find nothing untoward. Can anyone tell me before I take it to an authorised repair place if there is anything else I can check. Although the unit is some 4 - 5 years old it has never been misused and has only been used sparingly.

Any thoughts/comments gratefully received.