If you mean court records or the court file, start by contacting the clerk's office (either in person or by telephone) in the relevant county and ask them where criminal case files are archived. You will probably then need to make a personal visit to archives to look at the records on microfilm.
The records if they still exist would be stored by the court. You would need to go to the courthouse and request them. You will also have to pay for them.
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Go to the county seat. There should be a copy in the hall of records. Good luck.
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You will almost certainly have to go to court to get 20 year-old records. In Contra Costa county this would likely be in Martinez. But, call the court first to confirm.
The response above is not intended as legal advice. This response does not create an attorney-client relationship. Legal questions can only be fully answered through consultation with an attorney to whom you give full and accurate details. Anything you post here is not confidential and is not protected by the attorney-client relationship. It is highly recommended that you seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting.