As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT 2139, NR 1 DC GENERATOR CAUTION LIGHT CYCLES ON/OFF. MAINTENANCE PERFORMED DC GENERATOR OPERATIONAL CHECK AND VISUAL INSPECTION OF NR 1 DC GENERATOR IAW AMM TASK 24-31-00-720-801. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.