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Good evening. It is not likely your responsibility. You don't warrant this work forever and leaks in plumbing happen after a period of time. And, the contractor and/or the homeowner don't get the luxury of unilaterally putting the responsibility on you; after all, neither is an unbiased party....the owner wants someone to pay and the contractor simply wants to shift the blame to you. In order for you to be responsible, it would have to be shown you were negligent in some way and that negligence resulted in the leak. Given that there has been no leak for the first 4 years, it's not likely that anything you did in a negligent manner caused this leak; rather, it's likely that simply the pressure of water over time caused some pipe or seal to fail. Only if they can prove negligence could they hold you liable.
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