As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT FLIGHT ATTENDANT EMERGENCY OXYGEN MASK WOULD NOT DEPLOY DURING THE OPERATIONAL TEST FOR THE PASSENGER EMERGENCY OXYGEN SYS TEST. AFT FLIGHT ATTENDANT SEAT WILL BE INOP. SEATS FOR FLIGHT ATTENDANTS ARE 37C AND D. REPLACED O2 CONTAINER AND PERFORMED O2 MASK OPERATIONAL CHECK OF THE MANUAL MASK RELEASE PER AMM.