As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE FLIGHT ATTENDANT CALL SWITCH AT SEATS 11D/F BECAME STUCK IN THE ON POSITION CAUSING THE AURAL CHIME TO SOUND CONTINUOUSLY IN THE CABIN. WHEN THE FLIGHT ATTENDANT TRIED TO UNSTICK THE SWITCH THE OXYGEN MASKS ABOVE 11D/F DEPLOYED. THE CREW RETURNED TO CLT. MAINTENANCE STOWED THE OXYGEN MASKS AND DEFERRED THE PSU AT SEAT 11D/F PER MEL 25-70-01-4 CAT D. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.