Units Requested goin to dead leader

[captain caffeine]

I have two units , One which requests backup and the responding unit, I have the coding figured out for when to get the responders to move to help, but to where is a different problem,  Agrp  move getPos Leader Bgrp, that works but if the leader is dead they still go to the dead leader of B group,
 when what I want them to do is to goto the alive Leader of Bgroup.

  I've tried several methods  to resolve this problem and can not seem to find any solution. If anyone has any Ideas or
a snippet which make the idiot AI's in the responding group
go to the Living leader of requesting group instead of the dead one your help would be greatly appreciated.