As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2279: SEA TO RDM FLIGHT - AFTER TAKEOFF, FANS FAIL ED MESSAGE. MESSAGE WENT AWAY UPON WOW. AIRCRAFT WAS DIVERTED TO PDX. MAINTENANCE PERFORMED AN OPERATIONAL CHECK OF AVIONICS COOLING FANS IAW Q400 AMM TASK 21-25-00-710-801. FLAGGED NR 1 AVIONICS FAN INOP. REMOVED AND REPLACED NR 1 AVIONICS COOLING FAN WITH SERVICEABLE FROM STOCK IAW TASK 21-25-04-400-801 AND TASK 21-25-04-000-801. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.