As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A DECLARED EMERGENCY FOR SMOKE AND HEAT IN COCKPIT, THE PILOT OXYGEN MASK BROKE UPON DEPLOYMENT. IT APPEARS THE MASK WAS DEFECTIVE. IT WAS IN DUE O/H BY THE END OF JUNE 2012. THE MASK WAS REPLACED AND THE ACFT WAS RETURNED TO SERVICE.