What does an amber APU BLEED FAULT light indicate?

The amber APU BLEED FAULT light specifically indicates that a leak has been detected in the APU bleed air system. This warning signal is an important feature that alerts the crew to a potential issue affecting the integrity of the bleed air, which is essential for various aircraft systems, including engine starting and cabin pressurization. When this light illuminates, it signifies that the APU may not perform its function safely and effectively due to the detected leakage, prompting further investigation and, if necessary, corrective action.

In contrast, other answers pertain to different aspects of APU operation. An automatic shutdown would typically be indicated by different warning signals and isn't exclusively represented by the APU BLEED FAULT light. An overtemperature indication would also not trigger this specific light but instead might activate other warning indicators. The phrase "No greater than 95%" does not directly relate to the APU BLEED FAULT light either, as it suggests a performance metric or limit rather than a fault detection. Thus, the identification of a leak is the unique characteristic of the amber APU BLEED FAULT light.