I don't know, but I would bet that you can't. Instead, you probably replace the diaphram or the driver. Of course, since the EON is biamped, it could just as easily be a dead HF amp instead of a blown driver.
Don't take my word for it. Contact JBL tech support. If it can be done in the field they can tell you how, and help you aquire proper parts. If they don't recommend field repair, you would be smart to send it for repair.