As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OXYGEN MASK MANUAL DROP TEST THE AFT LEFT FLIGHT ATTENDANT MASKS DROPPED & IT WAS NOTED THAT THE OXYGEN GENERATOR WAS MISSING. REPLACED OXYGEN MODULE LEFT AFT POSITION IAW AMM 35-21-10. TEST OF PASSENGER OXYGEN MASKS AMM 35-21-00. OPERATIONAL CHECKED GOOD.