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I just found saw this.
http://forum.xda-developers.com/showpost.php?p=32921904&postcount=387
"Which version of ICS was your base? That being leak #1, leak #2/soak/"official" OTA.
If you are on anything but leak 1, you can not fxz back, then OTA to ICS again. If you are on leak 1, you can use my script in the dev section to go back to GB and install leak 1 again.
About the ONLY thing you might be able to do, if you are on leak 2/soak/"official" OTA, is to restore a backup of the stock ICS system partition, that you took with CWM."