Reconditioning a piano action is to be expected with all pianos periodically. This video explains some of the most fundamental aspects. Proper reconditioning has the ability to transform what could be considered a broken down old piano into one that still has many years of service to give. However, each piano must be accessed to determine both economic feasibility and quality of end result. I always caution not to go over-board with fancy work but stick with the fundamentals first.
This video is for educational purposes and not intended as a do-it-yourself tutorial.