As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE FLT 8675 PDX - LMT DISCREPANCY: DUE TO LOSS OF PRIMARY FLIGHT DISPLAY IN FLIGHT, THE AIRCRAFT WAS RETURNED TO PDX AND AN EMERGENCY WAS DECLARED. LANDED WITHOUT FURTHER INCIDENT. CORRECTIVE ACTION: MAINTENANCE REPLACED THE GDU620 DISPLAY UNIT.