There's no red arrow in the picture.
Only joint I see is a flared nut.
If that's it slide the nut back and check for a crack in the flare.
If it's cracked just slide the nut back cut the tube, reflare it and it should be good as new.
Only joint I see is a flared nut.
If that's it slide the nut back and check for a crack in the flare.
If it's cracked just slide the nut back cut the tube, reflare it and it should be good as new.