Help! Anyone know why generator won't retract?

Try tighten the nut on the line that's leaking oil to hopefully stop the spraying oil. I would reverse the two wires on the solinoid values for the generator slide and then push the button to extend/open the slide. If all else fails you can loosen both hydraulic lines on the cylinder for the generator slide and manually push it in. Put a rag under the back line to catch the oil that's going to come out.