The stoppage is the search with money behind it. «Sliding door will not open» gets typed by a business that cannot let anybody in and is counting the lost trading hours.
The service contract is the real demand. Whoever searches for it already owns a door and wants somebody to check it, not somebody to sell a new one.
Standards bring qualified searches. «Automatic door inspection required» comes from building managers and facilities firms who want a figure and a clause.
Building type sorts the demand. A supermarket, a hospital, a hotel and a car park ask four different questions of the same technology.
Parts for old installations are a quiet seam of gold. Somebody searching for a twenty-year-old operator wants to hear that parts still exist.
Response time belongs in the text, not in the quote. Two hours or two days decides the contract long before anybody asks the price.