As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ONT INFLIGHT ORD-SAN. CREW REPORTED CREW O2 LOW AND CAPTAINS O2 MASK BOX DAMAGED. FLIGHT DIVERTED ONT LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED CREW O2 BOTTLE AND CAPTAINS O2 MASK BOX. SYSTEM GROUND CHECK NORMAL OPERATION.