It is best to consult with a professional fire alarm technician to properly diagnose and repair any issues with your fire alarm. A technician will be able to determine the cause of the issue and provide advice on the best course of action. Depending on the issue, the technician may be able to repair or replace the fire alarm. It is important to note that some fire alarms are not user-serviceable, so it is important to consult with a professional to ensure that the repair is done correctly.