search for air bag leak

[blazer2007]

I have a leak somewhere on my fr. bags. The 2 bags are on one switch so the line goes from the switch to the fr. driver side and tee,s off to to the fr. bags. Has worked well like this for years except a pesky leak. The dr. bag looses air first and then takes away the air from the pass. bag. So ,is this telling me the leak is somewhere on the pass side ? Hope you understand my little story