As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A AIR TURN BACK - OXYGEN LOSS OVER 7OO LBS IN 2HRS REQUIRING AN ATB. DEFERRED O2 IND CREW IAW MEL 35-11-2. DMP ACCOMPLISHED O2 BOTTLES CONFIRMED OPEN AND FULL. BOTTLES AVERAGE WITHIN ARRIVAL SERVICE CHECK LIMITS. **SUPPLEMENTAL SDR** R/R CREW OXYGEN VOLTAGE AVERAGING UNIT AS PER MM 34-41. SYS OP CKS GOOD AT THIS TIME PER MM 35-21. THIS CLEARS M676166