What should be done if the PSU does not work manually?

Utilizing the Manual Release Tool is the appropriate action if the PSU (Passenger Service Unit) does not operate manually. This tool is specifically designed to allow crew members to manually activate the PSU when it is unresponsive to other commands. It provides a reliable method for restoring necessary functionality to ensure passenger comfort and safety during the flight.

Employing the Manual Release Tool is a standard protocol in scenarios where electronic or automated systems fail, allowing for immediate assistance without waiting for maintenance or additional support. This tool is crucial in enhancing operational efficiency in an environment where timely responses are essential.

The other actions, while perhaps well-intentioned, do not immediately resolve the malfunction of the PSU. Calling maintenance or notifying the lead flight attendant, while necessary steps in various situations, may not address the immediate need for manual control. Power cycling the PSU could potentially reset the system, but this might not always rectify the issue and would also involve more time, which isn't suitable when prompt action is needed.