What should be done if a boiler shows signs of leakage?

When a boiler shows signs of leakage, shutting down the boiler and inspecting it for repairs is the most appropriate action. This is crucial for several reasons. First, a leak can indicate a potentially serious issue with the boiler's integrity, which could lead to further damage or safety hazards if not addressed immediately. By shutting the boiler down, you prevent any possibility of exacerbating the problem, which could result in more extensive repairs or safety risks, including risk of explosion or fire.

Inspecting the boiler allows personnel to identify the source of the leak and assess the severity of the issue. This step is not only about finding and fixing the leak but also about ensuring the safety and efficiency of the entire system. A thorough inspection may reveal additional concerns that need to be addressed or provide insights into the required repairs.

The other options suggest varying degrees of negligence to the signs of leakage. Ignoring the issue or merely performing routine maintenance does not address the immediate danger posed by a leak, and cleaning the area while monitoring does not resolve the underlying issue. Thus, taking immediate action to shut down and inspect the boiler is the correct procedure to ensure both safety and functionality within the systems involved.