Often you can patch the line if the leak is in an accessible place. You can go to a good parts store, like a NAPA store and buy a piece of Automatic Transmission Cooler Line rubber hose, ( note: it must be for transmission cooler line, not fuel or vacuum hose!! ) and some clamps. Use at least 2 clamps at each end of the patch. You will have to cut the line, you can do this with a hack saw. It just depends on how accessible it is. Be sure to check and verify that the leaks is completely repaired .