The fix for that if you cant replace the line is take it loose at the cooler line and at the transmission. Clean inside of the line very well with carb or brake cleaner and air pressure. Expose rub in line and get a micro torch , some acid core solder and heat it up ,add the solder to the hole and wham back on the road. Use a small diameter rubber hose between it and the clamp so it wont happen again. ( Had to do this on side of road for a friend one day )

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euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck