When performing a leak check, what happens if leakage is found?

The correct action when leakage is detected during a leak check is to shut off the gas supply. This is a critical safety measure designed to prevent potential hazards, such as explosions or fire, that could arise from leaking gas. By promptly shutting off the gas supply, it allows for a controlled and safe response to the leak, enabling technicians to address the issue without putting individuals or property at risk. Additionally, this procedure aligns with safety protocols and regulatory standards that require immediate action in the event of any detected leakage. Prioritizing safety is essential, making the decision to shut off the gas supply not just necessary, but imperative.