behringer Inuke 3000 failure

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Hello All , I have 3 Inuke 3000 and one of thems fail, after I turn it off. using during the night and I try tu use againin the next morning but when I did withe color relay switch on and off in sequences and the amp do not start any more.
I sent the equipment to a Behringer repair shop and the guy told me that Analog Audio port is burned.😕😕😕😕
So I ask myself, how? and why the white color relay switch on/off in infinite sequence? In my opinion there is nothing to do with analog Audio port.
Another info the fan do not start during these, process, May be somebody can give me one step by step to check te power circuit instruction.
The techinical guy ask me US$ 150 to fix the problem😡😡😡, so more then half price of one complet new equipment

Any help will be great
Thanks
 
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