I have a leak at one end of a crimped pipe that joins into a T-piece copper fitting

Hi Figo

If you can get your hands on the correct crimping tool (check local plumbing supply store) you may be able to recrimp the leaking fitting. If you cannot get the proper crimp tool, talk to the guys at the counter of your local plumbing supply store and they should be able to get you some simple to use sharkbite or gatorbite press on fittings that you can use to make a long-lasting repair here... ;)

Good luck!

Mark