As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY OXYGEN GENERATOR/3 PERSON PURITAN P/N 117003-13, BOEING P/N S417T401-26 MFG DATE 6-89 LOT NUMBER 346. WHILE PERFORMING A ROUTINE REPLACEMENT, THE CANISTER WOULD NOT FIRE BY IT''S OWN MEANS. THE TRIGGERING MECHANISM DID NOT FIRE IT. IT HAD TO BE MADE SAFE BY USING A PUNCH AND A HAMMER TO FIRE IT.