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** REPAIR COMPLETE **
For the record I replaced the entire rusty old steel line with 5/16 flexible copper tubing per your suggestion. I left a few inches of the old steel at each end and used brass compression fittings to attach the two together. All in all I needed about 9-10 feet of copper tubbing ($9) and 2 fittings ($2/each). Mini tubing cutter cost me $8 and was worth far more.
Upon closer investigation the problem was exactly what you predicted - rust under the plastic clip. It looked pretty bad in other spots as well so I'm glad I did the whole thing.
When reconnecting everything the fittings leaked a little at first, but after tightening they seemed pretty solid. I'll keep an eye on things over the coming weeks/months (both fittings can be seen without removing anything or getting under the car).
Thanks again for this practical, easy fix!
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