I've never heard a a fire bottle thermal discharging. Is there a discharge plug?
Lucky you found the duct..... or that little gig would of just kept on repeating.
Hawker maintenance references are limited to none. Plus the fact that they're not making the aircraft anymore. I haven't dealt with one since they were sold to Beech.
Do the wiring manuals still come in long fold open sheets (ratty and worn)?
Have you ever viewed the main gear from the side of the aircraft. Check it out..... they're offset.