Problems with BigSuds and GlobalLB:PoolMember.get_object_status

I have been playing around with bigsuds to gather information from a GTM with great success with the exception of one object, GlobalLB::PoolMember,get_object_status(). What information, and in what format, is supposed to be passed?

The information on the wiki mentions passing pool_names and Common__IPPportDefinition but all the combination I have tried always yields the same response "bigsuds.ServerError: Server raised fault: 'Could not find element by name: members'".

Can anyone provide an example of how this is supposed to be used?