What is the minimum crew action during a MAP fail procedure?

The correct choice involves recycling the MAP power at the SPDS CDU, which is indeed the minimum crew action during a MAP fail procedure. This action allows the crew to reset the system in hopes of restoring functionality without escalating the situation unnecessarily. Recycling the power can sometimes resolve minor glitches or issues with flight data systems, making it a standard procedure in managing system failures.

The other options, while potentially relevant in different emergency scenarios, are not the immediate steps to take during a MAP fail. Initiating an emergency descent might be considered in severe situations where altitude is a concern, but it is not the first action for a MAP failure. Contacting maintenance is important for long-term resolution but not the immediate crew response in-flight. Preparing for ditching is a significant and drastic step, reserved for critical emergencies involving water landing and is not appropriate for a situation primarily indicating a MAP fail.