Not knowing what caused the leak I can only tell you what I have found very successful when a carpenter put a sheet rock screw into a copper tube pipe causing a small leak.
I isolate the leaking pipe, clean the heck out of the piping around this hole and braze this hole closed.
The brazing alloy is actually stronger then the tubing (87,000 PSI Tensile strength)
Use the sil flow type so you wont have the need for flux (self fluxing on copper) and have a fire extinguisher ready.
Heat the tubing add the filler metal KEEP AWAY as far as possible from other “soldered joints” you may need a few heat sinks placed near by