As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT A SMALL PIECE OF CO-PILOTS OXYGEN MASK SEPARATED FROM THE MASK ASSEMBLY. THE PLANNED FLIGHT WAS CANCELLED. THE MAINTENANCE TEAM REMOVED THE DEFECTIVE CO-PILOTS OXYGEN P/N 174252-92 S/N10710 AND INSTALLED AN OVERHAULED MASK ASSEMBLY. THE AIRCRAFT WAS RETURNED TO SERVICE. TOTAL TIME IN SERVICE 709.3 HRS