MEL 26-19 is same as for -800 now, there are several items like the loops, detection / suppression system, bottles, etc.
If the system itself is u/s than it is timeframe "C" and
May be inoperative provided associated compartment remains empty.
NOTE 1: Does not preclude the carriage of empty cargo containers, pallets, ballast or cargo restraint components.
NOTE 2: Class E cargo compartments require only the installation of smoke or fire detection systems (not suppression).