Preventive maintenance is work done on a schedule, before anything fails: services, inspections, lubrication, re-torquing and calibration, at the intervals the manufacturer or your own records set.
The field service technicians below list preventive maintenance, or a closely related skill, on their profiles. Post a mission for each service, or cover a maintenance shift with shift cover.
Read more in Preventive vs predictive maintenance, or see how shift cover works.