Not LED's.
Halogen.
The older switch boxes have a white wire. I wired the house 30 years ago.
Update: I was able to find a "combination" dual switch plate at my local hardware store in case I have to go that route.
All of the wall outlets in the garage are on the same circuit.
All of the lights, both inside and out (including the 3 pairs of spotlights/floodlights) and a garage door opener (possible culprit for my problems?) and a Heath/Zenith motion sensor dual floodlight above the main garage door, are on the other circuit.
This means that I couldn't run a wall module test because I have no way of plugging it into that circuit. Correction...I just checked and the Studio (the other new structure besides the garage) is on the same circuit as the 3 pairs of outside lights. So I just plugged the TM751 into one of the Studio outlets and voila - the dual flood lights outside the side door of the garage now turn on AND off!
So I'll change out that WS467 switch and see what happens to the 2 pairs of spotlights which don't respond at all to X10 commands.
Maybe for the other pair I'll switch the bulbs from halogen floods to just ordinary incandescent light bulbs to see if I can turn them on AND off, not just ON like with the halogens.
Onward and upward!