As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT RETURNED TO HNL ON ACCOUNT OF CREW OXYGEN PROBLEM. CAPTAIN O2 MASK HOSE CAME APART. EMERGENCY WAS DECLARED. MAINTENANCE SWAPPED CAPTAINS O2 MASK WITH ADDITIONAL OBSERVERS FIXED SEAT IAW AMM 35-12-41. LEAK CHECKED/OPS CHECKED GOOD.