What might be a consequence of failing to properly maintain the Sentinel's power system?

The consequence of failing to properly maintain the Sentinel's power system is that it can lead to the failure of systems requiring immediate repair. The power system is critical for the functionality of the Sentinel, as it supplies the necessary energy for all its operations. If maintenance is neglected, components within the power system may degrade or fail, which can result in significant malfunctions or complete system outages. These failures often necessitate urgent repairs to restore operational capability, thereby affecting overall mission readiness and effectiveness.

In contrast, increased operational readiness and enhanced system performance are typically outcomes of proper maintenance, not failures. Redundant power supply activation would occur as a protective measure in the event of a power system failure, so it is not a direct consequence of neglecting maintenance. The correct answer highlights the importance of regular upkeep to ensure that all systems function correctly and reliably.