As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CHECK SLIDE PRESSURE 3L CAUTION MESSAGE DISPLAYED ON FLIGHT ATTENDANT PANEL. DOOR IS ARMED AND DISPLAYS ARMED IN FLIGHT DECK'SDOOR/OXY PAGE. MAINTENANCE REPLACED THE L3 DOOR INFLATION RESEROIR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 25-62-49-00-001 WITH NO FAULTS NOTED.