Okay, here is it from our QRH (nearly the same):
Condition: Fire is detected in the related cargo compartment.
1. Cargo fire arm switch (FWD/AFT)....armed
2. Cargo fire discharge switch.....push
Push and hold for 1 second
Note: DISCH light may require upt to 30 seconds to illuminate.
3. Recirculation fan switch.......off
4. One pack switch........off
5. Plan to land at nearest suitable airport.
If i have to switch one pack off, why don't state which one? I would switch off the left one, to prevent any smoke delivered to the cockpit.