Responded to a service call to troubleshoot an outlet tripping a breaker. Upon arrival, the breaker was on and the circuit operational. The customer identified that a specific ticket printer caused the breaker to trip when plugged in, but requested I check the outlet and the breaker to be sure. The circuit is protected by a GFCI breaker due to its proximity to water sources. Inspected outlet connections, verified voltage readings, and confirmed proper connections and voltage at the breaker. No electrical issues were found with the circuit. Tested the printer on a separate GFCI outlet, where it immediately tripped again. Determined the printer has an internal fault and requires replacement.