OK, now I see what line that is. The bracket, number 42 in the drawing, needs to be loosened so that the line can be moved back and forth, and then the line can simply be pulled from the elbow as it is only held in place by the o-ring, number 36. Then you can unscrew the elbow from the housing. The connection from the elbow to the housing is an O-Ring Boss (ORB) connection, where the other o-ring, number 37, provides the seal where it is currently leaking. You should order replacements for both o-rings, 36 & 37, before taking it apart, and then once you put it back together using the o-rings it should no longer leak. The o-ring part numbers are:
#36 - Part No: 134372 - Description - o-ring, 1.109" ID x .139" Thk
#37 - Part No: 87057S95 - Description - o-ring, 90 Duro, 1.250" ID x .139" Thk
You should install the new o-ring #37 onto the threaded side of the elbow and thread the elbow into the housing first, then insert the o-ring #36 into the elbow as there is a recess inside that the o-ring #36 rides in, and then slide the line back into the elbow. If you put o-ring #36 onto the line first and try to slide it in it won't fit and the o-ring will simply slide up the line as you insert the line into the elbow (don't ask why I know this).