I have a copper water pipe behind a drywall ceiling. Turns out that when the ceiling was installed a drywall screw punctured the pipe. Many years passed until the screw rusted enough and it started dripping, causing a stain on the drywall ceiling. I listened to the recommendation of a guy on the HD floor and patched it with a metal epoxy putty. That held tight for a few years, now the stain is back.
Is there a simple way to patch this by cutting out the bad spot and using pressure fittings or something similar? I don't want to try soldering in that confined space. Any suggestions?