Thank you very much for the very prompt and helpful reply.
You are correct in assuming that there is no neutral in the existing 3-gang switch box. I converted my exterior house lights to X-10 lights so that they can flash when an intruder triggers my security system. I need the X-10 switch (XPT module plus XP4 keypad) at the kitchen back door so that I can have manual control over the exterior lights from that location. I thought it would work out well since I could create room in the 3-gang box for the XPT module by removing the dead 3-way switch, but after getting into the installation, I realized that the XPT requires a neutral wire.
I will go ahead with my plan to run a wire (both hot and neutral) up from the existing outlet, but that leaves me with a few more questions:
1) Can I just attach the new wire to the existing outlet's screw terminals, or should I cut the existing wires and splice in the new wires with wire nuts?
2) The flood light and the porch light are actually wired in series off the same switched circuit. Since the X-10 switch will now control each of these lights individually, I no longer need the circuit to be on a physical switch. Can I just remove the switch and connect the 2 wires for that circuit with a wire nut so that this circuit is "always on"?
3) When I remove the dead 3-way switch, should I just tape off the dead wire ends and leave them in the box?
Thanks again for your fast response to my initial question. I was not expecting such quick turnaround at 1:45 on a Sunday morning!
Noah