Can this be fixed at home?

At this point, if I were you, I would call the guy who set the third member up and tell him what happened. If he's at all ethical, he'll fix it. Now, if you don't want to rely on him again, I completely understand, in which case I recommend you go ahead and disassemble the third member yourself. It's really not that hard and the plus side is you'll KNOW it's done right when you are finished.