What was found
SEA FLIGHT NR 2026 CLIMBING OUT OF AROUND 6000" HEARD ENGINE SURGE-LOOKED AT TORQUE GAUGE AND SWA 130 PERCENT. FIRST OFFICER NOTICED AND BROUGHT POWER LEVERS AND TORQUE BACK WITHIN 1 SECOND. PROPS WERE AT 1050. NO MECHANICAL INPUT FROM PILOTS TO CAUSE SURGE. ON DESCENT NOTED A SIGNIFICANT 93.4 - 1 KNOB WIDTH POWER LEVER SPLIT AT TORQUE SETTINGS ABOVE 30 PERCENT ENGINE NR 1. MAINTENANCE REPLACED THE NR 1 ENGINE MFC, NR 1 PROP ASSEMBLY AND NR 1 NH PROBE. ALL OPERATIONAL CHECK GOOD. NO SURGE NOTED. AIRCRAFT RETURNED TO SERVICE.