As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPEN - LAV F/L81 FLIGHT ATTENDANTS REPORTED "POPPING, RATTLING" SOUND FROM OXYGEN MASK COMPARTMENT AND AN UNFAMILIAR ODOR. SUSPECT O2 MASK DISCHARGE.REMOVED & REPLACED EMERGENCY OXYGEN CONTAINER IN LAV F PER AMM 35-21-41. OPS CHECK OK. OK FOR SVC.