B&W Concept 90 CM2 bass module needs new crossover or replacement - thoughts?

Hi Folks, first post on this forum!

I have a pair of B&W Concept 90 CM1/2 speakers which I really like. However the crossover on one of the bass units burned out (don't know why), and I have subsequently been running the smaller bookshelf CM1s separately with a small Energy subwoofer (I know I could do better there, but it seems to provide a decent low end. I'd like to repair or replace the crossover in the CM2 that went out, or possibly just find another CM2 bass unit.  Would I be better off just using the subwoofer, or upgrading it? I really like the clear spacious sound of the CM1s and the way the concept 90s look and sound.

Thanks!