Performs preventive maintenance and repairs on transport refrigeration units (TRU) according to original equipment manufacturer (OEM) procedures, maintaining and repairing refrigeration trailer interior walls, floors, doors, and accessories (e.g., bulkheads, evaporator guards, and remote controller), operating transport refrigeration unit (TRU) in normal diagnostic and service test modes, diagnosing and repairing transport refrigeration unit (TRU) electrical systems using technical manuals and diagnostic tools (e.g., wiring diagrams, schematics, multimeter, laptop, and testers), transport refrigeration unit refrigeration system (e.g., reclaim/recycle, leak check, solder, repair, and recharge), and tractor climate control systems (e.g., auxiliary power units (APU), including heaters and air conditioning units), and communication systems using technical and electronic equipment. Installs and dismounts tires onto/off wheels using tire tools/machinery (for example, tire machine, tire bar, wheel dolly), repairs flats, and balances tires according to established protocols, and performs advanced axle alignments using electronic digital equipment (for example, Hunter/Beeline).