Elevators, which are frequently used and highly important means of vertical transportation within buildings, must undergo regular maintenance. Although many property companies issue work orders or outsource maintenance work, they do not specify detailed inspection items, such as the components and spare parts to be checked during monthly and annual inspections; furthermore, they often assume that once the equipment is outsourced to professional companies, ownership and responsibility are effectively transferred. Professional maintenance companies, on the other hand, usually lack a complete inspection knowledge base system and cannot even take photos, record and analyze inspection results on site, making it difficult to identify problems immediately. Coupled with inadequate supervision from the property owner, this is why elevators in many properties often break down again soon after being repaired.