how do you fix pre lit christmas tree lights

It's as easy as 1,2,3! First, make sure the power is off to the tree. Then, check the fuse box and replace any blown fuses. Next, find the burnt out bulb and replace it with a new one. Finally, test the lights by plugging the tree back in. If the lights still don't work, try swapping the wire to the opposite bulb to see if the problem is with the socket instead of the bulb. Good luck!