As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT SIDE O2 MASK BROKE WHILE DOING THE CLIMB CHECKS AND BEGAN LEAKING ALL THE 02. THE O2 WAS GONE BY THE TIME WE GOT BACK ON THE GROUND. RESERVICED OXYGEN IAW CE750 M.M. 12-10-45. REMOVED AND REPLACED LEFT SIDE OXYGEN MASK IAW CE750 MM 35-10-00. OPERATIONAL CHECK GOOD.