After a technician fire alarm system to monitor incoming of building b, 2nd floor, found that 3 and 4 has a problem and is currently in progress to fix the system to work correctly.
After a technician to inspect the building's fire alarm system B. The class 2,3 and 4 have a problem and are currently in the process of fixing the system to work normally.
After the technicians in monitoring system fire alarm of building B, it was found that I 2 3 4, and trouble. And now under the revised system to work normally.