As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REGULATOR LOW PRESSURE MESSAGE DISPLAYED ON LOWER ECAM WHEN MASKS ARE TESTED. REPLACED PRESSURE SWITCH 4WV IAW MM, NO HELP. REPLACED OXYGEN PRESSURE REGULATOR 4HT IAW MM (TWICE). NO HELP. PILOT REPORTED "ALONG WITH MESSAGE, WE DO NOT GET ENOUGH OXYGEN FROM OUR MASKS." REPLACED LP OXYGEN SHUTOFF SOLENOID.