Are you trying to gather information with which to present to an airline in an effort to gain compensation/refunds for delayed/cancelled service out of interest?
I honestly don't think you'll have any luck by suggested engineering was incompetent and should have found this fault long before it manifested itself as a leak.
Many thanks for your comprehensive reply T.R H ~ no the information is required on behalf of a client who is looking into the reasons airlines give for delays linked with the regularity (or otherwise) of certain problems. He is not linking (in any way) incompetent engineering with the/any delay more the length of time required to resolve the problem.
With regard to a certain flight I posted as Fargoo suggested (spotters thread) and a poster kindly sent all the information I required.
Thanks again.