Plumbing: replace faucets and sinks; repair galvanized, PVC, ABS and copper plumbing lines; troubleshoot location of leaks; apply advanced understanding of operational principals and preventive maintenance of steam and water boiler systems; apply comprehensive understanding of operational principals and preventive maintenance of building fire systems, including smoke detectors, flow valves, standpipes, fire alarm panels, etc. Electrical: repair and replace switches, outlets, heaters, exhaust fans, ceiling fans, and garbage disposals; troubleshoot electrical failure; read electrical and gas meter; repair and replace defective circuit breaker.