"The repairman" - A sci-fi story about a lighthouse, lizard like life forms, the lighthouse repairman, and a robot...

"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.