As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER OXYGEN CONTAINER AT SEAT 31DEF FAILED TO OPEN DURING MANUAL DROP TEST. REMOVED AND INSTALLED NEW O2 CONTAINER AT SEAT 31DEF PER AM M 35-21-41-000-001-A AND 35-21-41-400-001-A. REMOVED SAFETY RING PER AMM 35-21-41-400-001-A. OPERATIONAL TEST DONE ON TASK CARD 17-3523-1-7806 SEQ 449.