Thanks 'Tinyrice',
I'm sure I don't know what you mean by those "barstardised ones', this is also required on the RR powered aircraft, incl the C2 and D4 series, as well as the PW ones, that's the -7 series, incl. the 7R4G2 engines, can't remember offhand if it's the same for the GE CF6-50 and -80 engines, havn't seen one for awhile!
We always use the 'packs off' technique for t/o, and as such, the pylon valves are cycling, with nothing really to supply, until the first pack is selected at around 300', and as for the high stage valves, those lights should be out before power is stabilized, prior to advancing power for t/o!
Many thanks, but I'll keep looking.
Cheers.