You do not give any information here. How do you expect anyone to answer this question. Ask it again and state where the leak is. In the running length of the pipe or at a joint. Is it next to wood or insulation? Is it next to wiring? Next time us a little common sense and explain. Sorry to be so hard on you, but I could have helped if you had given the required information. Good luck with the next guy.
A copper pipe cutter, a piece of copper pipe so you can cut it to fit, two couplings, solder and a torch to sweat it all in. Sandpaper to clean the ends and some rosin unless you have rosin core solder.
Great question. So much info included so that we can correctly identify the issue and resolve it. Here's a great idea. Call a plumber. I don't think you are capable of fixing any problem with copper pipe.
