A few questions:
How did you put the wrong part on for so many years and not catch it? Was this due to an error in the customer supplied data like an incorrect BoM or an internal error such as a P&P machine programming error?
How wrong was the wrong part? Meaning, was it something like a wrong voltage or tolerance on a capacitor, or using a commercial grade part instead of an equivalent industrial grad part?
What is stipulated in your contract with your customer? A good contract should have liabilities and responsibilities of both parties clearly defined. In cases of ambiguity, the burden of proof tends to fall on the OEM, giving the little guy some advantage. Keep in mind I am NOT a lawyer.
For Legal Advocacy (I am assuming you are in the USA) you could check with your State Bar association, or your States Attorney Generals office. They may be able to point you in the right direction.
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