Which two faults will illuminate maintenance, reduced performance, unit, and own lights?

The illumination of maintenance, reduced performance, unit, and own lights indicates specific faults within a system that affect its operation and safety. The scenario represented by the second choice, which includes issues with the EP brakes not releasing and a problem with the Train Control Unit (TCU), is particularly critical.

When the electronic pneumatic (EP) brakes fail to release, it directly impacts the vehicle's ability to move efficiently, leading to reduced performance. This not only poses a risk to operational safety but also requires immediate maintenance intervention to address the brake functionality. The TCU, which plays a vital role in controlling various systems within the train, can also trigger alerts when there are failures or irregularities. This combination of faults is significant as they directly affect the vehicle's operational readiness and safety, thus justifying the illumination of those warning lights.

In contrast, the other options, while they may potentially lead to some operational challenges, do not typically trigger such comprehensive alerts in the same critical manner as issues related to brake functionality and the control unit do. Therefore, they do not align with the described symptoms of illumination as effectively as the EP brakes and TCU situation does.