Construction Review Online posted a great article regarding the preventative maintenance of elevators and escalators. The article goes into great detail about the responsibilities of building owners in terms of their vertical transportation equipment, the safety code for elevators and escalators and the importance of having an accurate and up-to-date Maintenance Control Plan (MCP) for each piece of equipment.
https://constructionreviewonline.com/2017/05/keeping-elevators-escalators-top-gear/