Down members of vsx but in state "standby"

[Stefano_Cappell]

As it can be seen from the attached image, we have a vsx with 3 members, 1 active and the others in standby, But actually the two standby members are shown to be in "down" state.

what does it mean? which checks can we perform on the machines in order to be sure about their state and that they are actually ready for a failover event? 

We need to get them ready for a jumbo hotfix, and it's pretty important that the redundancy works properly, 

thanks