The stairs of this house were in good condition, but the homeowner knew that it's good to make a light restoration from time to time (usually every 2-3 years). The process was not so special because we did light sanding, and matt finish.
This regular maintenance and restoration keep the floor in perfect condition for a very long time. Simultaneously, the service is not as expensive as the full sanding, and the refinishing was easy.
In most cases like this, there is no need for repairs, reclaiming, or nailing. The job took one day.