As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED THAT THE FLIGHT ATTENDANT PANEL DISPLAYS MESSAGES FOR THE 3L AND 3R DOOR PRESSURE TO BE CHECKED. MAINTENANCE FOUND DEU B TO BE FAULTY AND REPLACED IT PER AMM 23-73-47. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.