Tweeters on RS-7 not working

[JohnW]

I was using a pair of RS7s as front mains in our new house until we could purchase a pair of bookshelf speakers for our family room (RF-7 IIs didn't work in the room--they are now happily chugging along in my home office). Just picked up a pair of RB-61 IIs for the mains, and decided to use the RS7s as front height speakers for a 5.1.2 setup. 

But when I re-ran Audyssey EQ, there was a distinct lack of treble coming out of the right RS7, so I took it down, grabbed a tone generator, pulled off the woofer, and tested each speaker beyond the crossover. Woofer was fine, but only a faint signal coming from one tweeter, and nothing coming from the other. When I put the system back together and hooked the tone generator up to the binding posts, I only got sound from the woofer. 

I then dropped an email explaining the situation to Klipsch support. 

I've never really cranked these speakers up. 

Questions:

Is this a known issue? 

Has this ever happened to you, and what did you do to solve it? 

Does anyone know the model number of replacement tweeters for the RS7 and where to find them? 

Could this be a crossover issue? 

Thanks in advance.