Question

John, a supervisor at the local factory, receives frequent requests from workers on how to fix the machine they use.what should John do?

Answer 1

Firstly he should have educated the workers on how to maintain the machines to begin with, yet if it's out of their hands and a machine broke down he should try talking them through fixing if it's simple - and if it's something either extremely technical or dangerous John should replace or repair the machines via a technician (someone who knows how the machines work).
Depending on the machine a technician may be the first course of action, over all else.