Service for Aliante Loudspeakers?

I have a pair of Aliante Zeta loudspeakers (made in Italy). Tweeter in one of them not working. Any ideas on repair? Thanks! Benjamin
have you swapped the tweeters around to verify that this is the only issue. ?  
 if you are sure its only the tweeter, have you contacted Aliante to see what a replacement tweeter can be purchased from them ?