SDA not working in left speaker anymore

Hi Everyone,

Have a question for the collective wisdom of the group - I noticed today that the SDA driver and tweeter in my left speaker is no longer working. It's been working so I checked the cable connections and everything is secure and correct. Haven't moved the speakers and they haven't fallen or anything. Has anyone encountered this and if "yes" what did you do to fix it? I have a pair of the original SDA'2s:

They look like these:
http://forum.polkaudio.com/discussion/159791/picked-up-sda-2-custom-blade-blade-ideas

Thank you all for your help, I really appreciate it!

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