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Register yourself and car on Lexus website to get everything you need to know about your car; including service records. I could not post the link here but search for "Lexus Drivers Registration" and the best part it is FREE
Unless you are looking at what's covered under the powertrain warranty, I think you might be too late (and maybe even for the powertrain, depending on your mileage or in service date). But Lexus.com owner's resources are a good place to go.