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Reciever Onkyo TX-NR414 says: Check sp wires

Hello,

When playing music my Onkyo TX-NR414 reciever suddenly said "Check SP wires". So I googled, checked all the wires and connections for flaws, nothing. Disconnected all cables, had it off for a longer while, still this message appears.

Anyone a clue what this could be?

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