Amplifier speakers relay: how to pop open the cap on them?

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Amplifier speakers relay: how to pop open the cap on them?

Hey there I have an amplifier and I need to pop open the DEC relay speakers caps so that I can clean them due to the fact that before me the amplifier was started on with Volume Up causing the Brumm on the relays making it sound and not sound from time to time, only speakers pair A -B switch making a remedy for it from time to time! Thank you!
 
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