As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - EMERGENCY EQUIPMENT - FLIGHT CREW REPORTED THE CAPTAINS OXYGEN MASK WAS DEFECTIVE FRM 35-11-06-01. EMERGENCY, 100 PERCENT, AND NORMAL SELECTIONS ROTATE BEYOND EMERGENCY STOP VENTING MASK INTO COCKPIT AIR. MAINTENANCE REMOVED AND REPLACED THE CAPTAINS OXYGEN MASK AND REGULATOR ASSEMBLY IAW BMM 35-11-51, OPERATIONAL CHECK WAS GOOD.