Thanks for the drawing of that oxygen bottle.
http://www.pprune.org/rumours-news/5...ml#post8371268
I understand that the bottle is located within the MEC. So even if a potential failure of the bottle or its connection is not catastrophic, a scenario in which a pure oxygen atmosphere in the MEC bay is created seems possible? Apollo 1 comes to mind.
On the other hand it is hard to imagine the A/C continued on autopilot with the MEC destroyed by fire.
A report of a previous fire in the MEC of a 772 probably linked here before :
http://www.aaib.gov.uk/cms_resources...7%20N786UA.pdf