A replacement is NOT a repair, it is a replacement. If you purchased a new unit, then it is an asset. You would write it off or list it as an asset in the year you put it in service. Since you did this 3 years ago, you would need to amend your return for that year.
If you do not want to amend the return, you can just leave it go. It would result in a refund, so there is no tax penalty for not taking your refund.
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