Tivoli Audio model subwoofer

Hi , i have a tivoli audio model subwoofer connected to my model two radio . Unfortunately, the subwoofer stopped working . The led power light is red (sleep mode), but doesn’t power fully on when a signal is sent from the model two. And trouble shooting tips ? i’ve opened it up and looked at the capacitors, nothing burnt . will test with a multi meter soon .

Any help appreciate . Sorry if i posted this under the wrong thread .

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