As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED TO COLUMBUS. SECOND OBSERVER'S O2 MASK BOX STARTED BLOWING OUT A STEADY STREAM OF O2 WHERE SUPPLY LINE COMES INTO REGULATOR CONNECTOR. REMOVED AND REPLACED SECOND OBSERVER'S O2 MASK BOX PER AMM 35-12-44, OPS CHECK GOOD.