How to open. Help

Сould you please advise me on following matter.

I live in Singapore and recently purchased original Marshall stockwell (no warranty though). One of the speakers seems to be faulty as some rattling sound comes out of it...

At a Service center I was told they could repair the speaker, but they are not sure how to open this particular model.

Would you be so kind to provide me with instructions on how to open this type of speaker without damaging it?

Thanks in advance!

Best regards Anna

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