The lines should last many years, unless they are bent and straightened and was probably the case. The lines are copper and do not rust. Another thing is if they had the old r22 freon and the unit was changed to the new Puron gas which runs a much higher pressure. Are the lines leaking under the house for sure? Have someone like KT Management give a second opinion on the job. By federal law they can not continue to add freon without fixing the leak. When they backfilled the sink hole they probably stressed the lines and now from vibration from running they have cracked. Hope this helps.
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