Can support for weak cipher arcfour be removed on PortServer TS16?

I have updated the firmware on our PortServer TS16 to level G of Boot and level W1 of EOS, and have adjusted the secure access level to “secure”. However I am still getting flagged by Nessus scans for having support for the weak cipher suite arcfour.

Is there any way to set the supported ciphers on a PortServer TS16, or at least restrict support for arcfour? Thanks.