As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2335: "DU BAD CONFIG" DISPLAYED. C/W CHECKLIST AND MESSAGE REMAINED AFTER PROCEDURE. MAINTENANCE REMOVED AND REPLACED ED IAW Q400 AMM 31-61-01-000-801 AND 31-61-01-400-801. OPS TEST GOOD IAW 30-61-01-710-801. CLEARS PR1. AIRCRAFT RETURNED TO SERVICE.