The elevator technician checks in at the office on the routine maintenance stop and then disappears for quite some time. You may see the tech coming and going but, more often than not, he seems almost Mercurial in his appearing and disappearing. This leads many to wonder if another dimension exists beyond the walls of the hoistway or what tricks he may have up his sleeve and, if this is not the case, what exactly is going on between appearances or short walks to the service van.
Turns out, most of the time spent is not actually turning wrenches, but checking the elevator from head to toe or the top of the hoistway to the pit. All elevator technicians or their companies should be able to provide you with a comprehensive list of the things they look at and do every time they show up for routine maintenance.