P38 Air suspension mod

Hi all!
I wonder if anyone could give me any advise? I know the P38 air syatem has been done a million times,and i have searched..But not really found what im looking for..

1) How does the 6mm plastic air line connect to the Airbag/mount? Is it a brass adapter connection or a push fit plastic like up near the valve box..
2) If at "normal" ride height Engine turned off,and the Timer relay pulled out...Does this totally isolate the system?
For example:- if i was to release all the air from one corner,would the other 3 stay up?
Or if i was to manually inflate one end/corner to highest.would it "pop" a valve or just inflate all 4?..((my theory is as i have 4 valves,i can lower/inflate 1 corner without effecting others,and the valves are designed to hold back the added air?))
Providing they are all inflated to the same "normal" hight then the timer relay put back and engine started,will it give me loads of errors? Or should it just self level and continue as norm??
3) Is it the internal or external air line that is 6mm?

Sorry for all the questions,but would really appreciate any advise..
Many Thanks .LTel

I have a manual inflation kit fitted and have a slight leak in my n/s/f spring which when not not topped up the other corners would stay up so yes if you remove the relay you could lower 1 corner.

However i had gone into HARD FAULT so with the relay removed it didnt matter and as long as you have the ignition off and re-install it before starting it should be fine.

I would like to know if i remove it and start it will this cause it to go into fault mode as i have removed it just now but am weary about starting it just in case it does as i cant be bothered with it again.