Rescan AU effects?

When launching FInal Cut for the first time it scanned all of my audio units and one of them caused FC to crash. I removed the offending AU and now that I got an update for that particular AU, I would like Final Cut to rescan my AU plugins, but I can't find that option anywhere. When I want Logic Pro to rescan AU plugins I just delete the cache file located in User > Library > Caches, but it doesn't seem to work for Final Cut. How do I get Final Cut to rescan plugins? Also, is there a way to disable AU plugins in Final Cut without the use of a third party application?