Sunday The Beautiful Windy and I were putting up the pre-strung artificial Christmas Tree at the house and some of the lights were not working. We were bummed. 

So Windy went online and found this thing. I ran to Lowes and picked it up and it worked!  It fixes stings of lights that are damaged.  It's called the Lightkeeper Pro.  You follow the directions and it fixes the issues.

In fairness, it didn't fix EVERYTHING, but it did repair the lights we wanted fixed and we are good to go!  It did NOT fix all the lights, but it did a great job!