I don't know for sure what kind of problem the speakers may have. It it's an electronic issue (i.e internal amplifier/power source) or an issue with the speakers themselves (woofer or tweeter).
The gb-audio guys advertised that they can handle kevlar woofers (like yours) and powered speakers of other brands. They are on holidays until feb. 3rd.
Anyway they all seem to be able to repair high-quality speakers.