Gorde:
If the elbow is a quick connect for the air line, a solution is to trim off about a 1/4 to 1/2 inch on the hose and then slip it all the way back in the fitting. These lines will over time get a depression where the collar of the connector pinches the line and can be pro to leaking. I have had to do this with several lines on my 01 when I had it. Make sure it is trimmed squarely and then make sure you push the line back in completely. It's an easy fix, if that it the problem, which it sounds to me , it is. Also do this with the engine shut down.
Hope this Helps. Larry D