As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFT EMERGENCY DOORS NOT DISPLAYING ARMED ON FLIGHT ATTENDANT CIDS PANEL. MAINTENANCE REPLACED "B" DECODER ENCODER UNIT 300RH8 (DEU) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 23-73-47 WITH NO FAULTS NOTED.