the auxillary functions are controlled by a separate function control board that deals with the display lights, the selector lights will still show whatever function you select even if you are having a problem out on the mast or attachment. The actual function control is done with a separate function distribution board. Or at least that is the way crown used to do it, i'm sure the design hasn't change a whole lot since then.
The most likely scenario is what brewski suggested, check you mast control cable and any other harness's out on the mast and reach mechanism, i'm sure you will find damaged wires in the reach mechanism or shorted wires in the cable.