Only ticketed electricians and apprentice electricians can perform electrical work. A general maintenance person is not allowed to perform electrical work and should contact an electrician to do the work required.
Electrical maintenance is a preventative and planned measure to prevent electrical equipment from failing unpredictably when you need it the most. Electrical maintenance helps to find failing breakers, overloaded circuits, damaged/exposed wires, and catch electrical safety/code violations.
Electrical maintenance is important to catch potential costly failures before they end up failing. Regular routine maintenance can be used to find overloaded circuits in your electrical panel, to tighten electrical terminations, to avoid electrical fires and to catch safe and code infractions that previously would have gone unnoticed.