Which of the following could signal the need for immediate attention in maintenance work?

The signal that indicates the need for immediate attention in maintenance work is symptoms indicating equipment failure. These symptoms can manifest as unusual noises, decreased performance, leaks, or error codes, all of which suggest that equipment is not operating as it should and could potentially lead to more serious issues or outright failures if not addressed promptly.

Identifying these symptoms is crucial for maintenance personnel because they help prioritize tasks and ensure that problems are resolved before they escalate, thereby maintaining operational integrity and safety. In contrast, routine checks and balances, positive feedback from users, and planned maintenance schedules are important for overall maintenance strategy but do not directly indicate an urgent issue. They provide context and structure for maintenance tasks, but they do not necessarily reflect immediate threats to equipment functionality.