Design engineer ... makes it work for all supply, climates and configurations.
Production engineer ... replace expensive parts with cheaper parts, change parts that require more labour to assemble with parts that require less labour, remove parts untill it does not work  , put last part back.
Repair engineer ... find and replace faulty parts. If feasible use parts that will not fail, be easier to replace.
Maintenance engineer ... replace worn out parts with new parts, if feasible use parts that will last longer, be easier to replace.
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