Fascinating as Spock would say..
Solid blue Ready to allow a wireless client access to the network via Wi-Fi Protected Setup (WPS). AirPort Utility will indicate that the status light is solid green.
I have never in all my days seen a TC with a solid blue light. I have repaired 50 or so of them and not a one has ever blinked a blue light at me.. ever.
Just set your own password for wireless.. as soon as you do that WPS is disabled.
I have found automated systems for things like wireless actually work so poorly that it is seldom worth bothering with them. Set your own password.. make it 12 or more pure alphanumeric characters no spaces. Use WPA2 and you will not have issues.
Note the hack only works by brute force hack so it is still unlikely to happen, except from a smart neighbour.. as it is just too hard for the war driver when the guy down the street has a completely open system or still uses WEP. It is never a bad idea to keep your eye on clients on any wireless system. The TC has excellent logging page with wireless clients listed and graphed for you.