Assist Craftsmen in the installation, testing, calibration, troubleshooting, and repair of field instruments, including transmitters, transducers, controllers, switches, solenoids, relays, control valves, regulators, actuators, positioners, and instrument loops. As a Craft Maintenance Intern at Marathon's Galveston Bay Refinery, you can expect to become familiar with industry codes and best practices, build critical thinking skills, and gain hands-on experience in real world application of your studies.