Smells like another case of FSX pilot.
Guys, there is nothing wrong asking questions for your simulations (although at some point we need a simulator forum), but make it clear in the beginning that it is sim question.
I would be surprised if the 777 QRH doesn't exactly state what happens in the case the fire warning ceases, i know for sure the 737 does and i would not think the 777 is less sophisticated than the small one.