I've two Palo Alto firewalls in HA and connected to two switches as it show on the diagram.

Interfaces Te1/1/6 and Te1/1/5 on Switch-1 and Te1/1/7 and Te1/1/8 on Switch-2 are down until the firewall-1 goes down and firewall-2 take the active role.
I can't figure out how to set this alert with this conditions:
Alert interfaces Te1/1/5 and Te1/1/6 on switch-1 and Te1/1/7 and Te1/1/8 on switch-2 when they are down only when Firewall-1 is down. And not alert the default interface down for this interfaces.
Can anyone point me to right direction on how can I set this alarms?