I have a four year old pre lit Christmas tree. In the top section (3rd) some of the lights are not working, while others do. I followed the cord from the plug and they seem to split off with one side working the other not. I also did a current check and there is power running through the side with the non functioning lights. I have been through changing bulbs one at a time but am only about 1/2 way through and thought some some may be able to offer a quicker solution.
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