I would add the set of lights and forget about it until after you take it down. I had a pre-lit and this happened to me. I ended up throwing it out after the whole tree went out and got a new tree that had no lights on it. It works out better. It's nice to have the pre-lit though because it makes it easier to set up since the lights are already on it but it became a headache for me. I hope you get it fixed, that's a shame.
"You used up all the glue on purpose!"-A Christmas Story