As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
O2 LINE BEHIND 1ST OBSERVERS MASK BURST. ALL 3 OXYGEN SYS DEPLETED. COMPLIED WITH EA 1-3510-132815, DOC PART NR 1. INSTALLED CAP AND LEAKED CHECKED. REINSTALLED NR1 OBSERVER OXY MASK STORAGE BOX. CONNECTOR PLUG UNSECURED. REMOVED AND REPLACED NR 2 AND NR 3 O2 BOTTLES IAW MM 35-11-01-4.