What is the first step to manually release the Park Brake?

Locating the affected bogie is the first crucial step in manually releasing the Park Brake. This step is important because it allows the operator to identify which specific section of the train is having issues. Each bogie can be independently monitored and serviced; therefore, understanding which one is affected sets the groundwork for further diagnosis and mitigation of the parking brake issue.

Once the bogie is located, the technician can proceed with the necessary checks or interventions to safely release the Park Brake, ensuring that actions taken are directed towards the correct unit. This methodical approach minimizes the risk of overlooking critical components that may need attention, as well as enhancing safety during the operational process.

Other options may have their own roles in maintenance or troubleshooting but do not address the immediate necessity of identifying the source of the issue in relation to manually releasing the Park Brake. For instance, changing brake fluid or inspecting the brake lights could be relevant but occur later in the maintenance process once the affected bogie has been determined. Reducing train speed is more about operational safety than directly resolving the park brake issue.