Well...since we started with a fire.....
So far I've come up with the following:
ACDP remains pressurized and fully operational with the assumption it could provide hydraulic pressure for TR actuation
TR Isolation valve is apparently mounted in the pylon on the 76, sounds reasonable to consider same in the 77.
I've just been reading again about the Lauda Air inflight TR deployment here:
https://www.aviation-accidents.net/r...oad.php?id=181
Leads me to believe that de-powering the TR isolation valve would prevent an inadvertent TR deployment due to combinations of electrical short/valve contamination.
But this is all conjecture based on a lot of maybe's on my part as the accident aircraft had PW engines.