Can anyone tell me if the oil supply pressure is regulated on the Trent?
If it is a simple unregulated system, ala most turbine engines I know, then the pipe breakage would immediately show up as a drop in oil pressure. Trend monitoring, either manual or automatic, would pick this up.
Likely would not change the outcome, unless the crew shut down #2 immediately; but would be a valuable clue in sorting out the origin of the failure.