As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BHM/PHL - FLT 5751 - DURING TAXI OUT, THE CREW REPORTED THE OXYGEN PRESSURE WENT TO ZERO. THE AIRCRAFT RETURNED TO THE GATE AND MAINTENANCE FOUND THE OXYGEN LINE CRACKED. MAINTENANCE REMOVED AND REPLACED THE OXYGEN LINE, OPS CHECKED GOOD, AND AIRCRAFT WAS RETURNED TO SERVICE. (X)