As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT PANEL SHOWS A CAUTION FOR CHECK SLIDE PRESSURE ON 2R. MAINTENANCE REPLACED DECODER ENCODER UNIT B (DEU) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 23-73-47 WHICH CLEARED THE MESSAGE ON THE FLIGHT ATTENDANTS PANEL.