Just wanted to post my thoughts about the 707

1. There's always engine start pressure even if i dont have turned on the
gnd air. Gauge just above the hyd fluid shutoff.
2. When the turbo compressors are turned on shouldnt they give pressure to the high pressure system when eng bleeds are off?
3. Pressurization as CoolP said.
4. 10 mile warning light remains illuminated after complete shutdown.
now i forget something but i'll post that later  :)

regards
mikael