BeoLab 8000: problem with crackling noise

[KolfMAKER]

Situation / problem
I have a BeoLab 8000 (ser. 1171 xxxx) that sometimes produces a crackling noise. At that moment the music is pushed away, and sometimes the noise goes and the speaker is just silent for a short moment (a second or so). After that, it just plays music again.
The other speaker in this pair of 8000’s does not have this issue.
Both speakers have functioned without any problem until recently.

Question
I hope someone recognizes this ‘behavior’.
(a) What could be wrong?
(b) Where should I check?

[KolfMAKER]

Danke @Die_Bogener!

Concerning foamrot, it’s no foam. I made a typo with the serial. This 8000 has serial 1711 xxxx. So a MKII, built with the new white foam.

I will check for copperline cracks and defect caps.

Any other ideas are welcome.

[Author]

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