There is an Apple Store on Third Street Promenade, but they're not particularly fast or effective, though. Especially since Apple Stores are now predominantly geared towards mobile devices; I couldn't even find a mouse there last I went. So I'd call a few other places to check, like Mac Hollywood or Melrose Mac. I seriously doubt any place would be able to get it fixed for you in time for tomorrow.
In the meantime, are you trying to hook up a deck or a drive? If it's just storage, I'd suggest using a different drive interface to hook up the drive (eg. USB, eSATA), then copying the necessary content to an internal drive for now just to get through tomorrow. Have you tried other FireWire devices on these ports?
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