equivalent, supplemented by course work in electronic technology, or closely related study, AND three (3) years' experience in electronic and electrical troubleshooting of multi-component systems, basic networking, maintenance and repair of electro-mechanical systems or other heavy-duty transportation maintenance and equipment OR, an equivalent combination of education and experience sufficient to successfully perform the essential duties as those listed below. Physical Demands: Positions in this class typically require climbing, balancing, stooping, kneeling, crouching, crawling, reaching, standing, walking, pushing, pulling, lifting, grasping, feeling, talking, hearing, seeing and repetitive motions; Heavy Work: Incumbent may be required to perform heavy manual labor, occasionally lifting and maneuvering materials and equipment weighing up to 50 pounds and occasionally up to 100 pounds with assistance.