I've just checked on our FX (yes they are still in use!).
Go Menu, System Info & record the System S#. Thyen go Diagnostics & Reset System (nice icon with a guy with a sledgehammer!). Enter the S# & reset system. The S# is System Info is a shortened version of the full 14 digit S# on the chassis. You may need the latter to reset.
Once restarted the S# will be the default admin password.