code: func (b *BigIP) PoolMemberStatus(pool string, member string, state string, owner ...string) error {
  	config := &Node{}
  
  	switch state {
  	case "enable":
  		// config.State = "unchecked"
  		config.Session = "user-enabled"
  	case "disable":
  		// config.State = "unchecked"
  		config.Session = "user-disabled"
  		// case "offline":
  		// 	config.State = "user-down"
  		// 	config.Session = "user-disabled"
  	}
  
  	if owner[0] != "" {
  		config.AppService = owner[0]
  	}
  
  	return b.put(config, uriLtm, uriPool, pool, uriPoolMember, member)
  }
docs: // PoolMemberStatus changes the status of a pool member. <state> can be either
  // "enable" or "disable". <member> must be in the form of <node>:<port>,
  // i.e.: "web-server1:443".