As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED AN AIR RETURN TO JFK ON FLIGHT 4105 FOR CABIN ALTITUDE WARNING MESSAGE AFTER TAKEOFF DUE TO DEPRESSURIZATION AND MASKS DEPLOYING. REMOVED AND REPLACED THE 25 OXYGEN GENERATORS, OXYGEN MASK WERE STOWED, ALL CHECKS GOOD. COMPLIED WITH SERVICE CHECK ON AML 2372186 DATE 11/17/2012. COMPLETED TASK 35-23-13-03 DISCARD OXYGEN GENERATORS.