Final answer:
Before servicing an alarm system, the alarm monitoring company, local law enforcement or fire department, and possibly the insurance company should be notified in addition to the building owner or manager.
Step-by-step explanation:
Before servicing an alarm system, it is not only the building owner or manager who should be notified. Depending on the type and location of the system, several other parties may need to be informed. This often includes the alarm monitoring company, which needs to be aware of any potential downtime or false alarms that might occur during servicing. Local law enforcement or fire department may also need to be notified, as they might respond to alarms from the system. Additionally, the insurance company might require notification, particularly in commercial settings, as work on the alarm system could affect coverage terms.