As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED REG LOW PRESSURE INFORMATION ON THE DOOR-OXY PAGE. CREW ALSO STATED MASK IS NOT GIVING FULL PRESSURE WHEN DEMANDED. ACCOMPLISHED OPS CHECK IAW AMM FOR MASKS AND TSM TASK. REPLACED TRANSMITTER REGULATOR 4HT IAW AMM. ACCOMPLISHED LEAK CHECK AND OPS CHECK. O2 PRESSURE NORMAL WITH GOOD FLOW RATE, NO FAULTS. ALL DOORS ACCESSED CLOSED AND SECURE.