As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ED SCREEN WORKS BUT NUMERICAL INFORMATION DISAPPEARED. CYCLED ED SCREEN OFF THEN AS PER CHECKLIST, APPEARED TO WORK. MAINTENANCE INSPECTED ED CONNECTORS FOR SECURITY. PERFORMED ED OPS TEST IAW Q400 AMM TASK 31-61-00-710-801 AND OP TESTS IAW TC 6314101. ALL TEST GOOD. AIRCRAFT AND PLACARD REFLECT CAT I DUE TO HGS FAILURE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.