grey and red sound right. I just went and looked. Mine are blue and red and located at top of driver side front wheel wheel, just behing the washer fluid reservoir. I swapped the two single lines. Before doing that, the guy I bought it from had it looked at by a mechanic who noticed that when he shifted to 4wd and hit the actuator with a rubber mallet, the 4wd light came on. He thought it was the actuator, so we chopped a couple hundred off the price. When I got home, I hit the actuator (with lever in 4wd and the light as usual, not coming on) and he was right. I pulled the hoses off the actuator to check for breaks (another point to check, btw). They were fine and I replaced them. This is actually getting me to thinking that the two hoses might have been swapped at the actuator at some point in time and not at the VSVs. So maybe just swap them at the actuator instead of the VSVs. It should yield the same result.
This might help get you familiar with the system. My VSVs are on the other side, same general system though.