Gallo Nucleus Solo tweeter repair

Hi -

I have a pair of Gallo Nucleus Solos, and one of the tweeters seems to have gone out. I guess it could be a capacitor, but I haven't ventured far enough to disassemble the speaker.

I called Gallo, and they don't have any old parts, and have suggested I look on eBay ! A totally useless suggestion.

I've read a few of the threads on how hard it is to get the woofer out to check the wiring (I don't know how it could go bad) or the caps, but has anyone found a solution to this problem, or do I just sell the pair for parts ?

All suggestions welcomed.