UniFirst - - Responsibilities: Troubleshoot sources of equipment problems through observation and use of precision measuring and testing instruments.; Assist other maintenance personnel with emergency and non-emergency repairs.; Troubleshoot and repair Programmable Logic Controllers (PLC's) and associated control systems.; Follow blueprints, schematics, operation manuals, manufacturers instructions, and engineering specifications.; Perform boiler chemical and wastewater pre-treatment system testing, record results in logbooks / computer systems and make necessary chemical adjustments as required.