As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT 2026 - NR 1 ENGINE MANUAL CAUTION LIGHT ILLUMINATED, STAYED ILLUMINATED AFTER CHECKLIST PROCEDURE. MAINTENANCE RESET NR 1 ENGINE ECU PER DHC-8 200 AMM MCN 27631-01. RAN NR 1 AND NR 2 ENGINE AT VARIOUS POWER SETTINGS. NR 1 ECU STAYED ON. CYCLED NR 1 ECU OFF AND ON SEVERAL TIMES WITHOUT ANY DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.