I’m not familiar with the code so this is just a guess – but I would think this would be just a refactoring of the valve status. In fact, when talking this over with another engineer he suggested that the each of the 8 current display places represent the station status of each group of 8.
In other words – the first display digit would have a flashing 0 for MC station one, or a flashing 1 for the first station of the next group of 8 and so on. This would not take up ANY additional real estate. This would replace the code for the current station status.