To restring a pre-lit Christmas tree, you will need to follow these steps:
1. Unplug the tree from the outlet and remove all decorations.
2. Gently detach the light strands from the tree's branches.
3. Carefully remove the old light strings by pulling them out from the tree's internal wiring.
4. Inspect the tree's wiring for any damage or loose connections.
5. Carefully thread the new light strings through the tree's branches, making sure to connect each light strand securely.
6. Test the new light strings by plugging the tree back in and turning it on.