What was found
SEA FLIGHT NR 2220, ON CLIMB-OUT NR 2 DC GENERATOR CAUTION LIGHT, RAN CHECKLIST, NR 2 DC GENERATOR CAUTION LIGHT REMAINS ILLUMINATED. MAINTENANCE REPLACED THE STARTER/GENERATOR AND CONTROL UNIT. CONTROL UNIT PART NUMBER 51539-008C, SERIAL NUMBER 3730, TSN 27436, CSN 38720, TSR 10787. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.