As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER FLIGHT ATTENDANTS ARMED THE DOORS FOR DEPARTURE, THE FLIGHT ATTENDANTS PANEL INDICATED THE 2L IS NOT SHOWING ARMED AND THE MESSAGE CHECK DOOR PRESSURE IS DISPLAYED. MAINTENANCE SERVICED THE 2L DOOR DAMPER AND EMERGENCY OPERATION CYLINDER PER AMM 52-00-00.