The Repairman by Harry Harrison, Science Fiction, Adventure

My boss leaned back, wiped his hands on his handkerchief and gave me Lecture Forty-four on Company Duty and My Troubles. "This department is officially called Maintenance and Repair, when it really should be called trouble-shooting. Hyperspace beacons are made to last forever -- or damn close to it. When one of them breaks down, it is never an accident and repairing the thing is never a matter of just plugging in a new part." He was telling me -- the guy who did the job while he sat back on his fat paycheck in an air-conditioned office.