Every airbag I have ever seen has NPT screwed in fittings for the pressure line. It looks to me like that is where it is leaking. Pull the hose out of the quick connect, unscrew the fitting from the bag, clean and reinstall. You can use pipe sealant or 5 - 6 wraps of teflon tape on the threads, don't put it together dry as it will leak. Hand tight and then an additional 2 turns or so with a wrench. If it is leaking from the poly hose connection, often a clean cut on the hose 1/2" back will fix it.
That bag looks fine to me.