Repair or Replace mid-range driver for B&W M804

Greetings everyone,

I just noticed that the edge of my mid-range driver in my B&W Matrix 804 speaker is broken in some places. The speakers sound fine at low volume, but at medium volume, it is affecting the sound.

Should I try to seal the broken places or should I get a replacement driver. I guessed the plastic is brittle due to the age of these speakers, and it breaks. I am calling B&W on Monday to see if they have replacement drivers.

Did anybody replace the drivers of the B&W speakers ? Is it something you can do it yourself, or you have to bring it into a repair facility ?

Thanks for all your tips and recommendations.