How's your tool box? If you can't get the fittings to break loose and you round one off, well that's what a vise-grip is for. However replacing the lines should be the last resort to get these brakes working.
You may have to replace the MC and that would be easier than all those lines.
Take the fitting at the MC off and with the MC full, pump her up and if nothing comes out that fitting you need a new MC.
I have one I will give you for the postage.
