I read the deleted posts earlier on and have to share the same concerns.
On the 146 and I believe the Boeings as well, that the QRH or Emergency Check List as it is called on the 146, has had major changes quite recently ( in the last couple of years anyway.)
This was to stop exactly what you have mentioned, mucking around with the systems when you should be getting the a/c on the deck ASAP.
The 146 Check List was very long winded, shutting down packs, electrics, etc.
Now it is basically, Get on Oxy, Establish Communications and Divert to Nearest Suitable Airport.
