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Inside the boom. The two bolts on that last mast is where it hooks into. #9 in the one picture Rear pins are shown as well. I wouldn't suspect them since the lines didn't move when the cylinder retracted or attempted to. I would start with the lines first to see if there is pressure...

Yes but the override should bypass that. Especially if the line is jumping and fluid is going thru the valve when it is moved. Next step I would remove the lines going to the linear cylinder and see if there is pressure to it when the lever is pressed. If so then I would suspect the pin broke...

Check and see if there is a pin safety on that boom insert along the main boom. It may have a lever that locks down when it gets too far to not let it go anymore but then didn't release to let it come back in. I've seen it on a 1084A1 and a another grove variant crane.where it had a lever...

Donyou Do you hear any fluid trying to bypass when you move the control? Or see the hoses going to it jumping like it's trying to move?

You should be able to just jump the circuit on the back of it.. Use the winch to lift things not the boom. Even with it extended go up high and use your cable then swing it off. If you box is at the back of the truck then use the cable to slide it up front. That crane will handle that weight...

If it's an electronic safety that Is causing it to not close then yes it will help. If the cylinder is having issues you can remove the hoses going to it and try to retract it with a come along You can always put the boom over the bed and retract your outriggers so you can move it around and...

Did you hold in the manual override button while trying to retract?