You ask for signs of fire...well...the ABSENCE of any further signs is a sign.
Well yeah obviously, but the cargo compartments of a 737 are sealed. What specifically, from the cabin or flight deck, would you use to determine if there is or isn't a fire to go with the flight deck fire warning?
How long before signs of fire are evident? Ten, perhaps twenty minutes? Perhaps five minutes before mass panic ensures serious injury or fatalities.
If you decide to taxi to a stand, get the stairs and disembark, statistics are probably in your favor as all cargo fire incidents that I am personally aware of have been false alarms. But that isn't really a factor for consideration as far as I am concerned.
Anyway, there's my case. Just make a decision and deal with it
