dispatched to troubleshoot a fire alarm system at a multi-tenant office building where occupants reported that the alarm was not sounding on all floors during routine testing. After reviewing the system panel and wiring layout, I discovered that a faulty relay module was preventing proper signal transmission to certain notification devices. I replaced the defective module, then conducted a full system test to verify that strobes and horns were activating on every floor as required. Once confirmed, I documented the repair, updated the inspection logs, and informed the building manager of the completed work. The fire alarm system is now fully operational and code-compliant.