As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT OXYGEN MASK DOES NOT DEPLOY AT R2 DOOR ON OPERATIONAL CHECK OF MANUAL MASK RELEASE. MAINTENANCE REPLACED FLIGHT ATTENDANT O2 MASK CONTAINER ASSMBLY PER AMM 35-21-41. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.