What type of work is referred to as the repair of a known problem before a breakdown occurs?

The type of work referred to in the question is known as preventive maintenance. Preventive maintenance involves routine checks and repairs made to equipment or systems to prevent unexpected failures or breakdowns. By identifying potential issues and addressing them before they develop into significant problems, preventive maintenance aims to enhance the reliability and longevity of equipment, ensuring that systems operate smoothly without interruption.

This approach not only helps in minimizing unplanned downtime but also can lead to cost savings in the long run by avoiding more expensive repairs that occur as a result of neglecting maintenance. Regular servicing, inspections, and timely repairs based on a schedule are hallmarks of preventive maintenance, making it a proactive strategy in building maintenance.