The replacement slave has a different connector than the old one, so it's a new blue line (with the curled line 14 as an attached connection to the new slave). The blue line from the slave to where the next connection is, mid car, needs to be removed and replaced with the new line.
I can put wrenches on both sides of the brass connector, but it won't break loose, and don't want to force it, as it may twist the line.
