Factory Service Manuals you buy from Helm.Com
for lots of money (that is what i have done for 49 years)
Next-- you go to a repair shop & have them print just
the parts you need
The free stuff is not my area of expertise
I only use reliable sources of info
I've never dealt with this type of air system, but for other types of leaks I use soapy water in a spray bottle. Try spraying it over the airbag - the leak may show itself via small bubbles!
