Seems like a bug to me; however, I was unable to find a Bug ID in our system that matches your description.
You can set the SSIDs to only advertise on the 5Ghz band. In the 3.1 release, however, the 2.4Ghz LED turns Amber. Can you check your SSID to see if it is set the Both?
Try the upgrade to the 3.1 release..sounds like you are planning that. If that fails you might also try resetting this IAP with the reset button on the back of the unit then have it re-join the group to get its' config from the VC (assuming there are other IAPs in the group).
If that fails, please open a case with our TAC to confirm if this is SW or HW.