As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP DIVERTED WITH CREW O2 PRESSURE READING 0 ALONG WITH OVERHEAD PANEL. MX PERFORMED LEAK CHECK OF O2 SYSTEM IAW AMM 3510. FOUND F/O'S MASK FERREL LOOSE. REPLACED MASK. UNABLETO LOCATE OR DUPLICATE ANY OTHER LEAKS OR FAULTS. REPLACED CREW O2 CYLINDER WITH SERVICABLE UNIT IAW AMM 35-10. SYS CHECKS GOOD.