Thanks Max. I believe there was also a recent entry about fuel venting (although I can't remember which side).
I'm still a little puzzled, however, as both non-return valves would have to suddenly fail to get the pressure lights on both O/J's and I don't understand why the fuel in our #3 tank would be decreasing faster than the #2.
Anyway, return valves are something to look at.
Gas Path: There didn't seem to be any relevant CMC messages and, as far as I know, indications were normal earlier. Also, I would have thought that swarf would have caused this problem at all times, rather than at a particular point in flight.
Anyway, thanks! (to all)
Cheers.
NSEU