and get repaired and we get them back online as soon as possible. >> this is kind of a dinosaur in the industry. you have to troubleshoot a lot. a lot of times electronics don't fail outright. they get glitchy, and it's had 23 years to get glitchy. >> senior agv technician bruce adams runs the workshop. >> the mechanical aspect of it is pretty solid. we have parts for that. it's basically the electronics that are obsolete. they don't make them anymore. we're doing constant maintenance. this is pretty brutal environment for electronics. you can hear them bumping and grinding down the guide path over crumbling expansion joints. they take a beating but they keep on doing the job. >> but since they each weigh 1,600 pounds, it's best to stay out of their path. >> you have to be very aware of your surroundings working with these things because they can be dangerous.