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A typical day

A work order and a fault nobody can explain. You talk to whoever was standing there when it quit, read the schematic, and start narrowing it down with a meter and a scope. Half the day is diagnosis and a few minutes is the actual fix. Then you write up the repair, update the log, and drive to the next site. On a plant maintenance job you also do scheduled calibrations and preventive checks nobody notices until you stop doing them.