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It is the 3/8 air line into the rear 6 pack.  The 90 degree 1/4” NPT swivel fitting is leaking at the swivel.  It will be replaced with a street ell and a straight fitting.

Glad you found it. 

I have not had the time to dig deep into air leaks. I know I have a push to connect on the brake pedal valve that leaks occasionally. I have been able to get it to stop by moving the line around. Eventually need to get in there and replace the fitting.