B737 captain reported getting dissuaded by maintenance from initiating a logbook entry after discove...

Attributes
ACN	1714514
Time
Date	201912
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

Aircraft arrived late to ZZZZ. While doing my oxygen mask test; I observed a significant drop in oxygen pressure; over 400 psi. I had contract maintenance check the valve on the crew oxygen tank to see if it was open. He reported back; along with his supervisor; that he found the valve closed and that he opened it. The first officer (first officer) and I then tested both out O2 masks and there was no drop in oxygen pressure.I asked contract maintenance if they wanted me to put this in the log book and they requested that I not because of the time it would take to clear the paperwork with maintenance control. The crew oxygen bottle had been changed a few days ago. The aircraft flew several sorties a couple of days ago. It is possible that those crews would not have had O2 available if needed. In the future; [I] will record deficiencies in the log book even if it increases delays.

Original NASA ASRS Text

Title: B737 Captain reported getting dissuaded by Maintenance from initiating a logbook entry after discovering the shut off valve was discovered closed on the crew O2 bottle.

Narrative: Aircraft arrived late to ZZZZ. While doing my oxygen mask test; I observed a significant drop in oxygen pressure; over 400 PSI. I had Contract Maintenance check the valve on the crew oxygen tank to see if it was open. He reported back; along with his Supervisor; that he found the valve closed and that he opened it. The FO (First Officer) and I then tested both out O2 masks and there was no drop in oxygen pressure.I asked Contract Maintenance if they wanted me to put this in the log book and they requested that I not because of the time it would take to clear the paperwork with Maintenance Control. The crew oxygen bottle had been changed a few days ago. The aircraft flew several sorties a couple of days ago. It is possible that those crews would not have had O2 available if needed. In the future; [I] will record deficiencies in the log book even if it increases delays.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737 captain reported getting dissuaded by maintenance from initiating a logbook entry after discovering the shut off valve was discovered closed on the crew O2 bottle.