Klipsch Chorus I's tweeters are not working

I bought a set of Klipsch Chorus I's about a year ago and noticed the highs didn't seem like they should. I played them for the first time in a while the other day and noticed that nothing was coming from either tweeter. Since both tweeters are not working on these speakers what is the most likely problem ?? Do you take the woofer out to get to the crossover ?? Any ideas will be greatly appreciated....Thanks